PSA - Bent rims on gas gun cases

[The King]

FYI got to do some testing today regarding bent case rims. OCW testing, not depth testing.

Setup
6.5 Creedmoor JP LRP-07
Hornady Brass - some 1F in a gas gun that bent the rims and some 1F in a bolt gun in pristine shape
Full length sized in a Redding Die, Forster Press
H4350
2.800 seating depth
CCI BR2 primer

Results
During load dev 7 groups were shot with the 1F bent rim cases, and 7 groups shot with the regular cases.
These 7 groups with bent rims ranged from .58 for the hottest load to .07" for the 39 grain load.
The 7 pristine cased groups groups were .13 starting size at 39.0 grains, and .56 for the top end.

Conclusion
Contrary to my initial assumptions, the bent rims had no effect I was able to discern on the accuracy of the ammunition. YMMV.

 

[vinsonr]

Thanks for the info. I was just looking for info on this topic as I accidentally bent some rims seating primers with my CO-AX press. My concern is headspace due to them being slightly lifted by the bent rim sections. I had bumped the shoulders a couple thousandths and they do chamber as is. I'm sure they'll fire fine, but will only be loading up a few to test and load my other cases for use.

Did the bends flatten out any after firing the 2nd time?

 

[The King]

I can’t tell. The second firing was in the gas gun again. Lol. That said yeah headspace will be affected unless you bump it back some.