Question on Autoloading rifles

[Mobuck]

I didn't crimp bullets for the 742 rifles I used to have but I do on all the loads destined for the AR rifles I have now. I've seen plenty of bullets tellescoped into the case and several pictures of rifles believed to have been destroyed by this problem. The slight diff in accuracy that might be attributed to crimping is not going to be a problem with the uses for which I apply my AR rifles.
For all of those who say they've never crimped AR loads, that's your choice and I have mine. I've been told how many rounds of uncrimped ammo someone has fired and that's great. At this point, I've never had a headon collision with a semi either but if that happens, I'm sure it won't be good. Therefore, I do everything possible to prevent such an occurance.

 

[wogpotter]

I know what you mean about the crimp.
Basically you need to increase neck tension how you do it is open to several techniques.

Crimping is a popular one but limiting as both of the bullets I load for have no crimping cannelure! Whatever technique you pick I do a test this way. I load a dummy round, case & bullet loaded as normal, but no powder or primer. Next I measure the OAL. Then i drop it in the magazine first & load the mag to capacity over it. Then I extract the chambered round & re-measure it. If it has moved significantly I increase bullet pull/neck tension.