are you refering to the 308. xcm pistol 10 rnd mags?
^ no offence intended Hutchy, but if you are loading for a mag fed semi the theoretical max OAL of the round that the mag will allow should play no part in your decision in load development. Pick a bullet that tolerates the ‘jump’, because short of single loading off a sled for competition, they are all going to have that transitional movement from case to leade.




























