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Rifles, Reloading, Optics, Equipment
AR15/10 Rifles
Reloading for Gas Guns?
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<blockquote data-quote="Kevin Thomas" data-source="post: 484093" data-attributes="member: 15748"><p>BigSkyGP,</p><p> </p><p>CCI #41s are Mil spec small rifle primers. They're fairly hot, and would probably equate to what we'd normally consider a magnum primer. Their key difference is the fact that they're made with very heavy cups to prevent slam fires in guns with floating firing pins; like the M16 family. If you've never tried it before, fire a round or two (so the chambering is what it normally is during firing) and extract the next chambered round. You'll see a very pronounced dimple on the primer where the firing pin struck it during chambering. Yes, the firing pin actually hits the primer lightly when the bolt closes on a live round. As you can imagine, there's a fine balancing act between cups thick enough to withstand thsi sort of provocation without detonating. That's what Mil Spec primers are set up to do. This is also where the warings about not using Federal 210Ms in Garands and M14s (both of which also have floating firing pins) comes from. I've used a lot of the #41s and the #34s (large rifle Mil Spec) and never had a problem. I've also used many other commercial primers, but am careful to stick to those with harder cups; Remington 7 1/2s, Wolf SRM or 223 primers, etc.. </p><p> </p><p>I've seen slam fires in M14s, and it's pretty nasty. Never seen one in a M16 typr rifle, but the potential is there. Worth keeping an eye on, and avoiding if at all possible. Two eyes, ten fingers, that's all you get.</p></blockquote><p></p>
[QUOTE="Kevin Thomas, post: 484093, member: 15748"] BigSkyGP, CCI #41s are Mil spec small rifle primers. They're fairly hot, and would probably equate to what we'd normally consider a magnum primer. Their key difference is the fact that they're made with very heavy cups to prevent slam fires in guns with floating firing pins; like the M16 family. If you've never tried it before, fire a round or two (so the chambering is what it normally is during firing) and extract the next chambered round. You'll see a very pronounced dimple on the primer where the firing pin struck it during chambering. Yes, the firing pin actually hits the primer lightly when the bolt closes on a live round. As you can imagine, there's a fine balancing act between cups thick enough to withstand thsi sort of provocation without detonating. That's what Mil Spec primers are set up to do. This is also where the warings about not using Federal 210Ms in Garands and M14s (both of which also have floating firing pins) comes from. I've used a lot of the #41s and the #34s (large rifle Mil Spec) and never had a problem. I've also used many other commercial primers, but am careful to stick to those with harder cups; Remington 7 1/2s, Wolf SRM or 223 primers, etc.. I've seen slam fires in M14s, and it's pretty nasty. Never seen one in a M16 typr rifle, but the potential is there. Worth keeping an eye on, and avoiding if at all possible. Two eyes, ten fingers, that's all you get. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
AR15/10 Rifles
Reloading for Gas Guns?
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