I read in the military rifles section about the occurance of shoulder setback when repeatedly using mild loads with cast boolits in rimless rifle cases. It was explained that primer blast shoves the shoulder back. Enlarging the flash hole was recommended.
My questions:
1) How many firings before someone needs to be concerned about this?
2) Is there a particular velocity/pressure to adhere to to prevent this?
3) Do any of you guys enlarge the flash holes?
4) My current load in both 30-06 and 308 is 16 grains of 2400 powder with a 155 grain boolit. This load seems mild to me...too mild? Would I need to be concerned with setback with this load?
Thanks in advance...
Shooter