I have a 12" barrel LMT ar15. Just learning to reload. When working up my loads up I started getting split case necks.
I'm using
PRVI once fired brass (fired by me)
CCI small rifle primers
Ramshot TAC powder
Hornady 75 gr HPBT bullets.
Per Ramshot data Min load = 21.2 gr powder / Max load = 23.7 gr.
No problems shooting 21.4 gr or 22.0 gr . When I got upto 22.5 gr of TAC, 5 out of the 10 rounds I fired split the brass case necks. Factory new PRVI chronos the same velocity (2305fps) in my gun with no brass problems.
Since all Ramshot test data is with a 24" barrel vs my 12" barrel, I have no real velocity data to compare. Why the split necks? and What are overpressure signs I should look for when I can't use velocity from the data sheet due to short barrel? Thanks for any help!
I'm using
PRVI once fired brass (fired by me)
CCI small rifle primers
Ramshot TAC powder
Hornady 75 gr HPBT bullets.
Per Ramshot data Min load = 21.2 gr powder / Max load = 23.7 gr.
No problems shooting 21.4 gr or 22.0 gr . When I got upto 22.5 gr of TAC, 5 out of the 10 rounds I fired split the brass case necks. Factory new PRVI chronos the same velocity (2305fps) in my gun with no brass problems.
Since all Ramshot test data is with a 24" barrel vs my 12" barrel, I have no real velocity data to compare. Why the split necks? and What are overpressure signs I should look for when I can't use velocity from the data sheet due to short barrel? Thanks for any help!