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All,
I just started reloading .308 and was curious if anyone taper crimps for rifle? My first test batch, I taper crimped about half of the loads. I didn’t really notice anything significant as far as accuracy or brass issues so on subsequent loadings I stopped crimping altogether. Any ideas or thoughts would be most helpful. Thank you.
 

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Bottleneck rifle, no. Not unless it is a heavy kicker like 375 H&H, 416 Rigby or 470 nitro.

Straightwall handgun like 9, 40, 45, ect, yes. Always.
 

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I don't even crimp the biggest rifles' cartridges I have on hand, the .375 H&H Magnum and the straight-walled .405 Winchester. Certainly not the .308 which is fed to an M1A.

Handgun rounds? Yes, but I don't crimp the hooey out of those either, not even the Magnums and automatic pistol cartridges.
 

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I use the dimensions found in the SAAMI specs. That being said, bullet diameter can throw that off a bit say +/- .001, .002 in some cases.

Standing near shooters as an R/O I can see rounds leaving guns and entering targets. Over-crimping leads to separated jackets and sometimes "keyholing".

Under-crimping can lead to bullets being seated into cases during feeding, some say possibly causing overpressure.

Rather than saying I'm crimping I'd rather say I'm restoring the proper neck tension. The exception is as stated above IE. Magnum Revolver!

All the best,
 

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I don't even crimp the biggest rifles' cartridges I have on hand, the .375 H&H Magnum and the straight-walled .405 Winchester. Certainly not the .308 which is fed to an M1A.

Handgun rounds? Yes, but I don't crimp the hooey out of those either, not even the Magnums and automatic pistol cartridges.
Well, one thing is for sure. I crimp the “hooey” out of hot 357 that are being tube fed through the Henry! Same goes for the Deagle!
 
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