{"id":4507,"date":"2021-12-07T08:09:35","date_gmt":"2021-12-07T08:09:35","guid":{"rendered":"https:\/\/www.ammoman.com\/blog\/?p=4507"},"modified":"2021-12-07T20:23:42","modified_gmt":"2021-12-07T20:23:42","slug":"rimfire-vs-centerfire","status":"publish","type":"post","link":"https:\/\/www.ammoman.com\/blog\/rimfire-vs-centerfire\/","title":{"rendered":"Rimfire vs. Centerfire"},"content":{"rendered":"<h1><span style=\"font-weight: 400;\">Rimfire vs Centerfire: A Primer on Primers<\/span><\/h1>\n<p><span style=\"font-weight: 400;\">You can describe any modern ammunition cartridge in a number of ways. There\u2019s the type with a rim at the end of the casing or where the case is the same diameter all the way through.\u00a0 It could be whether the cylinder of the cartridge has a taper, or whether the neck of the cartridge is smaller than the base. Today, we\u2019ll look at two different ways of making a cartridge go \u201cBANG,\u201d and describe the differences of rimfire vs centerfire cartridges.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">First, a quick rundown of what\u2019s inside a modern round of ammunition. Up front, there\u2019s (<\/span><a href=\"https:\/\/www.ammoman.com\/blog\/blank-ammo\/\"><span style=\"font-weight: 400;\">usually<\/span><\/a><span style=\"font-weight: 400;\">) a bullet, and gunpowder to send the bullet on its way down the barrel. Then there\u2019s the case, which holds everything together, and a primer, which is at the rear of the cartridge. How that primer is located on the rear of the cartridge is what makes the difference between a rimfire vs a centerfire round.\u00a0<\/span><\/p>\n<h2><span style=\"font-weight: 400;\">Rimfire vs Centerfire: It\u2019s All About The Bang<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">When we talk about the primer of a round of ammunition, we\u2019re talking about a thin piece of metal that contains a chemical compound (originally mercury fulminate) which emits a spark when struck. The firing pin of the gun hits that thin metal and transfers the energy of the impact to the priming compound. This compound ignites, which touches off the gunpowder, and the gun goes bang.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The biggest difference with rimfire vs centerfire ammo is where that thin metal container which holds the primer is located, and how it is integrated into the cartridge. The primer inside a rimfire round is contained in a thin metal rim around the bottom of the case. The primer for a centerfire round is inside a small cup in the center of the case. Firing a rimfire round starts on the rim of the case, and firing a centerfire round begins at the center of the rear of the case.\u00a0<\/span><\/p>\n<h3><span style=\"font-weight: 400;\">Heavy Metal? No, Thin Brass\u00a0<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Getting a primer, any kind of primer, into the cartridge proved to be quite a chore. Using a priming compound to set off a round of ammo has been around since the early 1820\u2019s, when <\/span><a href=\"https:\/\/science.howstuffworks.com\/flintlock5.htm\"><span style=\"font-weight: 400;\">percussion caps<\/span><\/a><span style=\"font-weight: 400;\"> were invented. Combining the percussion cap, bullet, powder and case took longer, and was first accomplished in 1845 with the introduction of the <\/span><a href=\"https:\/\/www.kentaurguns.com\/flobert-ammunition\/\"><span style=\"font-weight: 400;\">6mm Flobert<\/span><\/a><span style=\"font-weight: 400;\"> ( aka 22 BB) round.\u00a0\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">6mm Flobert is a very low powered round. That&#8217;s also true of many of the early rimfire rounds such as 22 Short and 22 Long. There were other cartridges as well, such as .<\/span><a href=\"https:\/\/www.ima-usa.com\/products\/original-u-s-civil-war-era-56-56-spencer-cartridges-in-box?variant=29496711774277\"><span style=\"font-weight: 400;\">56-56 Spencer<\/span><\/a><span style=\"font-weight: 400;\">, the first metallic cartridge used by the military in the iconic Spencer rifle.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Aside from all being rimfire cartridges, all of these rounds used black powder. That meant they were very underpowered compared to modern rounds, which use high pressure smokeless powder to drive the bullet forward at higher velocities than what is possible with black powder. The higher velocities mean thicker cartridge walls are needed to contain the pressure of the expanding powder. That&#8217;s where a rimfire round runs into trouble.\u00a0<\/span><\/p>\n<h3><span style=\"font-weight: 400;\">Rimfire Is Built Differently<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">The walls of a rimfire cartridge need to be thinner so the energy of the firing pin can be transferred to the primer. But thin cartridge walls can\u2019t handle the pressure of high power cartridges, which is why most ammunition sold these days is centerfire ammunition rather than rimfire.\u00a0<\/span><\/p>\n<div id=\"attachment_4513\" style=\"width: 310px\" class=\"wp-caption alignright\"><a href=\"https:\/\/www.ammoman.com\/blog\/media\/primer_types.jpg\" data-rel=\"lightbox-image-0\" data-magnific_type=\"image\" data-rl_title=\"\" data-rl_caption=\"\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-4513\" class=\"wp-image-4513 size-medium\" title=\"\" src=\"https:\/\/www.ammoman.com\/blog\/media\/primer_types-300x213.jpg\" alt=\"centerfire and rimfire cartridge\" width=\"300\" height=\"213\" srcset=\"https:\/\/www.ammoman.com\/blog\/media\/primer_types-300x213.jpg 300w, https:\/\/www.ammoman.com\/blog\/media\/primer_types-1024x728.jpg 1024w, https:\/\/www.ammoman.com\/blog\/media\/primer_types-768x546.jpg 768w, https:\/\/www.ammoman.com\/blog\/media\/primer_types-1536x1092.jpg 1536w, https:\/\/www.ammoman.com\/blog\/media\/primer_types-610x434.jpg 610w, https:\/\/www.ammoman.com\/blog\/media\/primer_types-400x284.jpg 400w, https:\/\/www.ammoman.com\/blog\/media\/primer_types-1080x768.jpg 1080w, https:\/\/www.ammoman.com\/blog\/media\/primer_types-627x446.jpg 627w, https:\/\/www.ammoman.com\/blog\/media\/primer_types.jpg 1600w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><p id=\"caption-attachment-4513\" class=\"wp-caption-text\">The primer cup in the center of the cartridge on the round on the left indicates it&#8217;s a centerfire round<\/p><\/div>\n<p><span style=\"font-weight: 400;\">As we said before, the primer in a centerfire cartridge is held in a small cup held in a pocket in the center of the back of the case. That cup is made of a thin piece of metal (usually brass) that is crushed when struck by the firing pin, touching off the primer and firing the round. Because the cup fits into a pocket from the shell casing, the metal of the casing can be as thick as needed to contain the force of the gunpowder igniting, leading to high-power rounds like <\/span><span style=\"font-weight: 400;\">.44 Magnum<\/span><span style=\"font-weight: 400;\">, .<\/span><span style=\"font-weight: 400;\">50 BMG<\/span><span style=\"font-weight: 400;\"> and a host of other types of ammunition<\/span><\/p>\n<h3><span style=\"font-weight: 400;\">Centerfire Takes Over\u2026 Almost<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">This flexibility means there is a big difference in what\u2019s available in rimfire vs centerfire ammo. .22 Long Rifle (22LR) is one of the oldest cartridges in common use, and it dominates the rimfire market. Other common rimfire cartridges are .22 Winchester Magnum (aka <\/span><a href=\"https:\/\/www.ammoman.com\/22-wmr-1\"><span style=\"font-weight: 400;\">22WMR or 22 Magnum<\/span><\/a><span style=\"font-weight: 400;\"> and <\/span><span style=\"font-weight: 400;\">17 HMR<\/span><span style=\"font-weight: 400;\">. 22 Magnum is exactly what it sounds like: <\/span><a href=\"https:\/\/www.ammoman.com\/blog\/22lr-vs-22wmr\/\"><span style=\"font-weight: 400;\">A more powerful version of the 22LR cartridge<\/span><\/a><span style=\"font-weight: 400;\">. 22 WMR is useful for targets which require a bit more power than what 22LR can provide, and it\u2019s not bad as a defensive cartridge either.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The idea for 22 Magnum began with Winchester. 17 HMR, on the other hand, is a creation of Hornady ammunition. 22 WMR is meant to be a ramped up version of 22LR. 17 HMR has a different task. A 17 HMR round fires a small (.17 caliber), lightweight (17-20 grain) cartridge that zips along at 2600 fps or faster. This combination makes it an excellent round for small game and varmint hunting out to 100 yards and beyond. These are ranges where 22LR can run out of energy and fall short of the target.\u00a0<\/span><\/p>\n<h4><span style=\"font-weight: 400;\">Shoot What Works For You<\/span><\/h4>\n<div id=\"attachment_4515\" style=\"width: 310px\" class=\"wp-caption alignright\"><a href=\"https:\/\/www.ammoman.com\/blog\/media\/rimfire_cartridges.jpg\" data-rel=\"lightbox-image-1\" data-magnific_type=\"image\" data-rl_title=\"\" data-rl_caption=\"\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-4515\" class=\"wp-image-4515 size-medium\" title=\"\" src=\"https:\/\/www.ammoman.com\/blog\/media\/rimfire_cartridges-300x257.jpg\" alt=\"rimfire cartridges\" width=\"300\" height=\"257\" srcset=\"https:\/\/www.ammoman.com\/blog\/media\/rimfire_cartridges-300x257.jpg 300w, https:\/\/www.ammoman.com\/blog\/media\/rimfire_cartridges-1024x877.jpg 1024w, https:\/\/www.ammoman.com\/blog\/media\/rimfire_cartridges-768x658.jpg 768w, https:\/\/www.ammoman.com\/blog\/media\/rimfire_cartridges-1536x1315.jpg 1536w, https:\/\/www.ammoman.com\/blog\/media\/rimfire_cartridges-610x522.jpg 610w, https:\/\/www.ammoman.com\/blog\/media\/rimfire_cartridges-1080x925.jpg 1080w, https:\/\/www.ammoman.com\/blog\/media\/rimfire_cartridges-627x537.jpg 627w, https:\/\/www.ammoman.com\/blog\/media\/rimfire_cartridges.jpg 1600w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><p id=\"caption-attachment-4515\" class=\"wp-caption-text\">L to R: 22 Long Rifle, 17 HMR, 22 WMR. All rimfire cartridges, all really use for today&#8217;s gun owner<\/p><\/div>\n<p><span style=\"font-weight: 400;\">We should probably discuss the variety of carriages for centerfire ammunition, but since that\u2019s essentially every other type of ammunition on the planet other than 22LR, 22 WMR or 17 HMR, we\u2019d soon run out of room. Suffice to say that rimfire ammunition (especially 22LR) has its own purpose and use. 22LR is less costly than centerfire ammunition. However, it is very effective and capable inside of its niche, with millions of rounds fired each year by gun owners all over the world.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Because each type of round has a different role in the firearms world, the question isn\u2019t rimfire vs centerfire. The question is, how does each of these types of rounds fit into the kinds of shooting you enjoy. For instance, I\u2019ll train young people who are new to guns on firearms using 22LR. That round is also very popular for hunting small game, shooting competitions like <\/span><a href=\"https:\/\/www.rimfirechallenge.org\/\"><span style=\"font-weight: 400;\">Rimfire Challenge<\/span><\/a><span style=\"font-weight: 400;\"> and training events like the <\/span><a href=\"https:\/\/www.ammoman.com\/blog\/the-appleseed-project-building-better-citizens-and-marksmen\/\"><span style=\"font-weight: 400;\">Appleseed Project<\/span><\/a><span style=\"font-weight: 400;\">. My centerfire guns are \u00a0the larger part of my gun collection. I use them to defend my life as well as shooting competitions like <\/span><a href=\"https:\/\/www.ammoman.com\/blog\/lets-look-at-idpa-divisions\/\"><span style=\"font-weight: 400;\">IDPA<\/span><\/a><span style=\"font-weight: 400;\">, hunting larger game like <\/span><a href=\"https:\/\/www.ammoman.com\/blog\/using-5-56mm-ammo-for-hog-hunting\/\"><span style=\"font-weight: 400;\">feral hogs<\/span><\/a><span style=\"font-weight: 400;\"> and attending training classes such as <\/span><a href=\"https:\/\/www.ammoman.com\/blog\/gunsite-a-return-to-the-roots-of-firearms-training\/\"><span style=\"font-weight: 400;\">Gunsite<\/span><\/a><span style=\"font-weight: 400;\">.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The ammunition of today is the product of decades of development and research and is the best quality ammo that\u2019s ever been available to gun owners. Whichever rimfire or centerfire ammo you choose to use in your guns, remember that a gun (or the ammo it fires) is only as safe and accurate as the person pulling the trigger. Enjoy the ammo choices we have today, and make sure to do so safely.\u00a0<\/span><\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Rimfire vs Centerfire: A Primer on Primers You can describe any modern ammunition cartridge in a number of ways. There\u2019s the type with a rim at the end of the casing or where the case is the same diameter all the way through.\u00a0 It could be whether the cylinder of the cartridge has a taper, [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":4514,"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":[3,13,19],"tags":[],"class_list":["post-4507","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-intro-to-guns","category-pistol-shooting-tips","category-rifle-shooting-tips","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>Rimfire vs. Centerfire - AmmoMan School of Guns Blog<\/title>\n<meta name=\"description\" content=\"Rimfire vs Centerfire cartridges serve different purposes, but both should be a part of a well-rounded gun collection.\" \/>\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\/rimfire-vs-centerfire\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Rimfire vs. Centerfire - 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