{"id":4881,"date":"2022-08-02T16:56:01","date_gmt":"2022-08-02T16:56:01","guid":{"rendered":"https:\/\/www.ammoman.com\/blog\/?p=4881"},"modified":"2022-07-27T16:57:38","modified_gmt":"2022-07-27T16:57:38","slug":"308-twist-rate-chart","status":"publish","type":"post","link":"https:\/\/www.ammoman.com\/blog\/308-twist-rate-chart\/","title":{"rendered":"308 Twist Rate Chart"},"content":{"rendered":"<h1>308 Twist Rate Chart<\/h1>\n<p>Perhaps you already know why it\u2019s important to have an appropriate rate of twist for your rifle barrel. If that\u2019s the case, please bear with us for a moment while we briefly cover the essentials of rifling and twist rate. Don&#8217;t worry, we&#8217;ll skip any lessons in history or physics.<\/p>\n<p>Inside every modern rifle (or pistol) barrel, you will find rifling. The lands and grooves of rifling are arranged in a spiral formation. Rifling enables the bullet to engage with the barrel\u2019s bore, exit the muzzle rotating, and continue to rotate as it flies forward. Like a football, a bullet is more accurate when you put a little spin on it.<\/p>\n<p>A barrel\u2019s rate of twist describes the spiral of its rifling. A 1:8\u201d rate of twist means the rifling makes one complete rotation for every eight inches of barrel. If a foot-long barrel has a 1:12\u201d rate of twist, then a bullet fired through it will make exactly one full rotation before exiting the muzzle.<\/p>\n<p>The correct rate of twist is necessary for accurate performance. A bullet which does not receive adequate rotational stability from its barrel will turn sideways mid-flight. A tumbling bullet fails to keep its ballistically efficient nose facing downrange, so it loses velocity at an accelerated rate. It will very likely hit its target sideways, thus severely limiting potential penetration depth as well.<\/p>\n<p>That\u2019s the condensed introduction to twist rate. Now we come to the real meat and potatoes part of this discussion:<\/p>\n<h3>What Is the Right Twist Rate for a 308 Rifle?<img loading=\"lazy\" decoding=\"async\" class=\"alignright wp-image-4977 size-medium\" title=\"barrel rifling\" src=\"https:\/\/www.ammoman.com\/blog\/media\/rifling-inside-barrel-300x300.jpeg\" alt=\"Rifling inside a barrel\" width=\"300\" height=\"300\" srcset=\"https:\/\/www.ammoman.com\/blog\/media\/rifling-inside-barrel-300x300.jpeg 300w, https:\/\/www.ammoman.com\/blog\/media\/rifling-inside-barrel-150x150.jpeg 150w, https:\/\/www.ammoman.com\/blog\/media\/rifling-inside-barrel-610x610.jpeg 610w, https:\/\/www.ammoman.com\/blog\/media\/rifling-inside-barrel-627x627.jpeg 627w, https:\/\/www.ammoman.com\/blog\/media\/rifling-inside-barrel-440x440.jpeg 440w, https:\/\/www.ammoman.com\/blog\/media\/rifling-inside-barrel.jpeg 768w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/h3>\n<p>The ideal rate of twist for a 308 rifle would give the bullet a gyroscopic stability factor of 1.3 at minimum, although 1.5 is preferable if you are firing over longer ranges. If a bullet\u2019s stability factor falls beneath the 1.3 threshold, its ballistic coefficient (the measure of its ability to overcome air resistance in flight) decays proportionately. It will exhibit a steeper trajectory and its overall accuracy will suffer as the result.<\/p>\n<p>A bullet which rotates too little has an inferior stability factor. But what if a bullet rotates too much? Does that similarly harm its accuracy? The answer is: perhaps.<\/p>\n<p>An overly aggressive rate of twist may cause the bullet to exhibit excessive yaw and spin drift. It will accordingly perform less accurately over extremely long ranges. Delicate and lightweight bullets are also at risk of tearing themselves apart if they rotate too quickly. To keep things safe you should strive for a stability factor between 1.3 and 2, although exceeding 2 will likely produce no discernible detriment in performance.<\/p>\n<h2>.308 Win Twist Rate Chart<\/h2>\n\n<table id=\"tablepress-58\" class=\"tablepress tablepress-id-58\">\n<thead>\n<tr class=\"row-1\">\n\t<th class=\"column-1\">Bullet Weight (gr)<\/th><th class=\"column-2\">Bullet Length (in)<\/th><th class=\"column-3\">Bullet Type<\/th><th class=\"column-4\">1:14<\/th><th class=\"column-5\">1:12<\/th><th class=\"column-6\">1:11<\/th><th class=\"column-7\">1:10<\/th><th class=\"column-8\">1:8<\/th>\n<\/tr>\n<\/thead>\n<tbody class=\"row-striping row-hover\">\n<tr class=\"row-2\">\n\t<td class=\"column-1\">110<\/td><td class=\"column-2\">0.668<\/td><td class=\"column-3\">FMJBT<\/td><td class=\"column-4\"><span style=\"color:#008000;\">4.419<\/span><\/td><td class=\"column-5\"><span style=\"color:#008000;\">6.015<\/span><\/td><td class=\"column-6\"><span style=\"color:#008000;\">7.158<\/span><\/td><td class=\"column-7\"><span style=\"color:#008000;\">8.661<\/span><\/td><td class=\"column-8\"><span style=\"color:#008000;\">13.533<\/span><\/td>\n<\/tr>\n<tr class=\"row-3\">\n\t<td class=\"column-1\">130<\/td><td class=\"column-2\">1.074<\/td><td class=\"column-3\">SP<\/td><td class=\"column-4\"><span style=\"color:#008000;\">1.408<\/span><\/td><td class=\"column-5\"><span style=\"color:#008000;\">1.916<\/span><\/td><td class=\"column-6\"><span style=\"color:#008000;\">2.281<\/span><\/td><td class=\"column-7\"><span style=\"color:#008000;\">2.76<\/span><\/td><td class=\"column-8\"><span style=\"color:#008000;\">4.312<\/span><\/td>\n<\/tr>\n<tr class=\"row-4\">\n\t<td class=\"column-1\">150<\/td><td class=\"column-2\">1.11<\/td><td class=\"column-3\">FMJBT<\/td><td class=\"column-4\"><span style=\"color:#008000;\">1.479<\/span><\/td><td class=\"column-5\"><span style=\"color:#008000;\">2.013<\/span><\/td><td class=\"column-6\"><span style=\"color:#008000;\">2.395<\/span><\/td><td class=\"column-7\"><span style=\"color:#008000;\">2.898<\/span><\/td><td class=\"column-8\"><span style=\"color:#008000;\">4.529<\/span><\/td>\n<\/tr>\n<tr class=\"row-5\">\n\t<td class=\"column-1\">155<\/td><td class=\"column-2\">1.256<\/td><td class=\"column-3\">HPBT<\/td><td class=\"column-4\"><span style=\"color:#FF0000;\">1.071<\/span><\/td><td class=\"column-5\"><span style=\"color:#008000;\">1.458<\/span><\/td><td class=\"column-6\"><span style=\"color:#008000;\">1.736<\/span><\/td><td class=\"column-7\"><span style=\"color:#008000;\">2.1<\/span><\/td><td class=\"column-8\"><span style=\"color:#008000;\">3.281<\/span><\/td>\n<\/tr>\n<tr class=\"row-6\">\n\t<td class=\"column-1\">165<\/td><td class=\"column-2\">1.175<\/td><td class=\"column-3\">SP<\/td><td class=\"column-4\"><span style=\"color:#008000;\">1.382<\/span><\/td><td class=\"column-5\"><span style=\"color:#008000;\">1.881<\/span><\/td><td class=\"column-6\"><span style=\"color:#008000;\">2.239<\/span><\/td><td class=\"column-7\"><span style=\"color:#008000;\">2.709<\/span><\/td><td class=\"column-8\"><span style=\"color:#008000;\">4.232<\/span><\/td>\n<\/tr>\n<tr class=\"row-7\">\n\t<td class=\"column-1\">168<\/td><td class=\"column-2\">1.232<\/td><td class=\"column-3\">HPBT<\/td><td class=\"column-4\"><span style=\"color:#FF0000;\">1.228<\/span><\/td><td class=\"column-5\"><span style=\"color:#008000;\">1.671<\/td><td class=\"column-6\"><span style=\"color:#008000;\">1.989<\/span><\/td><td class=\"column-7\"><span style=\"color:#008000;\">2.407<\/span><\/td><td class=\"column-8\"><span style=\"color:#008000;\">3.76<\/span><\/td>\n<\/tr>\n<tr class=\"row-8\">\n\t<td class=\"column-1\">170<\/td><td class=\"column-2\">1.247<\/td><td class=\"column-3\">FMJBT<\/td><td class=\"column-4\"><span style=\"color:#FF0000;\">1.2<\/span><\/td><td class=\"column-5\"><span style=\"color:#008000;\">1.633<\/span><\/td><td class=\"column-6\"><span style=\"color:#008000;\">1.944<\/span><\/td><td class=\"column-7\"><span style=\"color:#008000;\">2.352<\/span><\/td><td class=\"column-8\"><span style=\"color:#008000;\">3.674<\/span><\/td>\n<\/tr>\n<tr class=\"row-9\">\n\t<td class=\"column-1\">175<\/td><td class=\"column-2\">1.288<\/td><td class=\"column-3\">HPBT<\/td><td class=\"column-4\"><span style=\"color:#FF0000;\">1.125<\/span><\/td><td class=\"column-5\"><span style=\"color:#008000;\">1.531<\/span><\/td><td class=\"column-6\"><span style=\"color:#008000;\">1.822<\/span><\/td><td class=\"column-7\"><span style=\"color:#008000;\">2.205<\/span><\/td><td class=\"column-8\"><span style=\"color:#008000;\">3.445<\/span><\/td>\n<\/tr>\n<tr class=\"row-10\">\n\t<td class=\"column-1\">180<\/td><td class=\"column-2\">1.26<\/td><td class=\"column-3\">SP<\/td><td class=\"column-4\"><span style=\"color:#FF0000;\">1.233<\/span><\/td><td class=\"column-5\"><span style=\"color:#008000;\">1.678<\/span><\/td><td class=\"column-6\"><span style=\"color:#008000;\">1.997<\/span><\/td><td class=\"column-7\"><span style=\"color:#008000;\">2.417<\/span><\/td><td class=\"column-8\"><span style=\"color:#008000;\">3.776<\/span><\/td>\n<\/tr>\n<tr class=\"row-11\">\n\t<td class=\"column-1\">185<\/td><td class=\"column-2\">1.308<\/td><td class=\"column-3\">FMJBT<\/td><td class=\"column-4\"><span style=\"color:#FF0000;\">1.137<\/span><\/td><td class=\"column-5\"><span style=\"color:#008000;\">1.548<\/span><\/td><td class=\"column-6\"><span style=\"color:#008000;\">1.842<\/span><\/td><td class=\"column-7\"><span style=\"color:#008000;\">2.229<\/span><\/td><td class=\"column-8\"><span style=\"color:#008000;\">3.483<\/span><\/td>\n<\/tr>\n<tr class=\"row-12\">\n\t<td class=\"column-1\">210<\/td><td class=\"column-2\">1.459<\/td><td class=\"column-3\">HPBT<\/td><td class=\"column-4\"><span style=\"color:#FF0000;\">0.94<\/span><\/td><td class=\"column-5\"><span style=\"color:#008000;\">1.279<\/span><\/td><td class=\"column-6\"><span style=\"color:#008000;\">1.523<\/span><\/td><td class=\"column-7\"><span style=\"color:#008000;\">1.842<\/span><\/td><td class=\"column-8\"><span style=\"color:#008000;\">2.879<\/span><\/td>\n<\/tr>\n<tr class=\"row-13\">\n\t<td class=\"column-1\">225<\/td><td class=\"column-2\">1.558<\/td><td class=\"column-3\">HPBT<\/td><td class=\"column-4\"><span style=\"color:#FF0000;\">0.831<\/span><\/td><td class=\"column-5\"><span style=\"color:#FF0000;\">1.132<\/span><\/td><td class=\"column-6\"><span style=\"color:#008000;\">1.347<\/span><\/td><td class=\"column-7\"><span style=\"color:#008000;\">1.63<\/span><\/td><td class=\"column-8\"><span style=\"color:#008000;\">2.546<\/span><\/td>\n<\/tr>\n<tr class=\"row-14\">\n\t<td class=\"column-1\">230<\/td><td class=\"column-2\">1.602<\/td><td class=\"column-3\">OTM<\/td><td class=\"column-4\"><span style=\"color:#FF0000;\">0.783<\/span><\/td><td class=\"column-5\"><span style=\"color:#FF0000;\">1.066<\/span><\/td><td class=\"column-6\"><span style=\"color:#FF0000;\">1.269<\/span><\/td><td class=\"column-7\"><span style=\"color:#008000;\">1.535<\/span><\/td><td class=\"column-8\"><span style=\"color:#008000;\">2.399<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n<p>To summarize: You want your 308 rifle\u2019s barrel to give the bullet a stability factor between 1.3 and 2 at minimum. That said, a higher stability factor is not likely to harm accuracy.<\/p>\n<h3>Stability Formulas: Math Time<\/h3>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-large wp-image-4978\" src=\"https:\/\/www.ammoman.com\/blog\/media\/AR-10-barrel-1024x483.jpg\" alt=\"AR-10 rifle barrel tip\" width=\"1024\" height=\"483\" srcset=\"https:\/\/www.ammoman.com\/blog\/media\/AR-10-barrel-1024x483.jpg 1024w, https:\/\/www.ammoman.com\/blog\/media\/AR-10-barrel-300x142.jpg 300w, https:\/\/www.ammoman.com\/blog\/media\/AR-10-barrel-768x362.jpg 768w, https:\/\/www.ammoman.com\/blog\/media\/AR-10-barrel-610x288.jpg 610w, https:\/\/www.ammoman.com\/blog\/media\/AR-10-barrel-1080x509.jpg 1080w, https:\/\/www.ammoman.com\/blog\/media\/AR-10-barrel-627x296.jpg 627w, https:\/\/www.ammoman.com\/blog\/media\/AR-10-barrel.jpg 1200w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/p>\n<p>You can use <a href=\"https:\/\/www.ssusa.org\/content\/how-to-calculate-rifling-twist-rates-for-stabilizing-bullets\/\">multiple mathematical formulae<\/a> to determine a bullet\u2019s stability factor: the <a href=\"https:\/\/www.vcalc.com\/wiki\/AndrewBudd\/Greenhill+Formula+for+Optimal+Rifling+Twist+Rate\">Greenhill formula<\/a>, the Miller formula, or the improved Miller formula. You would need a calculator to follow any of these formulae, so you might as well use <a href=\"https:\/\/www.jbmballistics.com\/cgi-bin\/jbmstab-5.1.cgi\">JBM Ballistics\u2019 stability factor calculator<\/a> and save yourself the trouble.<\/p>\n<p>Even JBM Ballistics\u2019 straightforward stability calculator requires more information than many shooters know about their <a href=\"https:\/\/www.ammoman.com\/308-762x51-ammo\">308 ammo<\/a> and bullets. You probably don\u2019t want to yank the bullet out of a loaded cartridge just so you can measure its overall length. That\u2019s why we prepared a handy 308 barrel twist chart for your reference.<\/p>\n<p>It\u2019s plain to see how much a bullet\u2019s weight influences its ideal rate of twist. A heavier bullet requires more rotations before it can achieve optimal rotational stability.<\/p>\n<p>That said, while consulting our chart it is important to keep in mind that ballistics are heavily impacted by atmospheric conditions and subtle differences between cartridges. This is true even when manufacturers deliver ammo from the same factory lot.<\/p>\n<p>Furthermore \u2013 and more importantly \u2013 the bullet\u2019s muzzle velocity and the rifle\u2019s barrel length both greatly influence the stability factor the bullet will achieve. Muzzle velocity varies considerably cartridge to cartridge. That&#8217;s why our chart, which assumes a 2,800 fps muzzle velocity across the board, is not a definitive guide to 308 barrel twists. But it does provide a solid idea of what you should be shooting for!<\/p>\n","protected":false},"excerpt":{"rendered":"<p>A look at some of the optimal pairings for 308 twist rate barrels and bullet weights.<\/p>\n","protected":false},"author":4,"featured_media":4975,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[5],"tags":[],"class_list":["post-4881","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-guns-201","et-has-post-format-content","et_post_format-et-post-format-standard"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>308 Twist Rate Chart - Bullet Weights &amp; Barrel Twist Rates<\/title>\n<meta name=\"description\" content=\"A 308 twist rate chart. We can help you pair your barrel&#039;s twist rate with the best weight of ammo for solid performance.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.ammoman.com\/blog\/308-twist-rate-chart\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"308 Twist Rate Chart - Bullet Weights &amp; Barrel Twist Rates\" \/>\n<meta property=\"og:description\" content=\"A 308 twist rate chart. We can help you pair your barrel&#039;s twist rate with the best weight of ammo for solid performance.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.ammoman.com\/blog\/308-twist-rate-chart\/\" \/>\n<meta property=\"og:site_name\" content=\"AmmoMan School of Guns Blog\" \/>\n<meta property=\"article:published_time\" content=\"2022-08-02T16:56:01+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.ammoman.com\/blog\/media\/308-twist-rate-chart.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"2000\" \/>\n\t<meta property=\"og:image:height\" content=\"1207\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Eric\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Eric\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.ammoman.com\/blog\/308-twist-rate-chart\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.ammoman.com\/blog\/308-twist-rate-chart\/\"},\"author\":{\"name\":\"Eric\",\"@id\":\"https:\/\/www.ammoman.com\/blog\/#\/schema\/person\/c796b86a95e834bb5b3d7c3e5627648c\"},\"headline\":\"308 Twist Rate Chart\",\"datePublished\":\"2022-08-02T16:56:01+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.ammoman.com\/blog\/308-twist-rate-chart\/\"},\"wordCount\":716,\"commentCount\":1,\"publisher\":{\"@id\":\"https:\/\/www.ammoman.com\/blog\/#organization\"},\"image\":{\"@id\":\"https:\/\/www.ammoman.com\/blog\/308-twist-rate-chart\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.ammoman.com\/blog\/media\/308-twist-rate-chart.jpg\",\"articleSection\":[\"Guns 201\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.ammoman.com\/blog\/308-twist-rate-chart\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.ammoman.com\/blog\/308-twist-rate-chart\/\",\"url\":\"https:\/\/www.ammoman.com\/blog\/308-twist-rate-chart\/\",\"name\":\"308 Twist Rate Chart - Bullet Weights & Barrel Twist Rates\",\"isPartOf\":{\"@id\":\"https:\/\/www.ammoman.com\/blog\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/www.ammoman.com\/blog\/308-twist-rate-chart\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/www.ammoman.com\/blog\/308-twist-rate-chart\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.ammoman.com\/blog\/media\/308-twist-rate-chart.jpg\",\"datePublished\":\"2022-08-02T16:56:01+00:00\",\"description\":\"A 308 twist rate chart. 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