- Thread starter wbell
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Re: crimping 308
I never found it necessary to crimp in any of my semi or full auto 308/7.62 NATO
I never found it necessary to crimp in any of my semi or full auto 308/7.62 NATO
Re: crimping 308
Please disregaurd.
Please disregaurd.
Re: crimping 308
+1 for the Lee factory crimp.
+1 for the Lee factory crimp.
Re: crimping 308
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Mosdet</div><div class="ubbcode-body">No crimping here. Why do you think you need to?</div></div>
i always thought there could be issues with bullet setback.
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Mosdet</div><div class="ubbcode-body">No crimping here. Why do you think you need to?</div></div>
i always thought there could be issues with bullet setback.
Re: crimping 308
I'm on the fence with crimping. I've done some very informal tests with bullet-setback or forward movement of a non-crimped round when chambered by a semi-auto(AR15/10 type, M1A, Browning BAR). I used a micrometer/bullet comparator to measure OAL after the round is chambered and in most cases/weapons I have seen very little, if any at all, movement. I've even put the same round through the chambering cycle 4-5 times(live fire) and seen only minor deviations in OAL with most guns. I did see one particular MIA that was very "hard" chambering and would beat the bullet in pretty far, but I think there was something a little off with the gun and it was an exception. With crimping accuracy can improve or degrade, it all depends on the individual weapon.
I do sometimes put a light crimp on my hunting rifle ammo with a Lee Crimp die due to the fact that I chamber/unload the rounds frequently during the day/season when going into camp or in/out of vehicles and want to make sure the bullets don't setback with the repeated chambering(or being in a lightweight gun during recoil). With the proper amount of neck tension, crimping is probably completely unnecessary but the gun will shoot 3/4" with the crimp so why the hell not.
I'm on the fence with crimping. I've done some very informal tests with bullet-setback or forward movement of a non-crimped round when chambered by a semi-auto(AR15/10 type, M1A, Browning BAR). I used a micrometer/bullet comparator to measure OAL after the round is chambered and in most cases/weapons I have seen very little, if any at all, movement. I've even put the same round through the chambering cycle 4-5 times(live fire) and seen only minor deviations in OAL with most guns. I did see one particular MIA that was very "hard" chambering and would beat the bullet in pretty far, but I think there was something a little off with the gun and it was an exception. With crimping accuracy can improve or degrade, it all depends on the individual weapon.
I do sometimes put a light crimp on my hunting rifle ammo with a Lee Crimp die due to the fact that I chamber/unload the rounds frequently during the day/season when going into camp or in/out of vehicles and want to make sure the bullets don't setback with the repeated chambering(or being in a lightweight gun during recoil). With the proper amount of neck tension, crimping is probably completely unnecessary but the gun will shoot 3/4" with the crimp so why the hell not.
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