Shot my new Tikka T3 Lite yesterday and it didn't go well. Made up some loads with new brass that was necksized, Hornady 225s and 68 grains of RL-19. I was looking for a mild load to use for break-in. The max is 73.3 of RL-19 for this bullet. I checked the casings after the second shot and both primers were totally flat filling all of the primer pocket and there was a bulge just past the belt. Pulled the rest of the bullets and weighed the powder. It was 68 grains. The RL-19 was still there on the bench. Primers were Fed 215.
Went back today with a box of factory Federal 225. Ther primers were not as flat but the ridge is still there. It extends about .085 ahead of the belt and the case diameter in that area is .519. I compared some Remington brass fired from a friend's Mod 70, there is no ridge and the brass measures .513 or less in the same area.
Is this normal for Tikkas? Since the increase in case diameter is greater that .005, is this a sign of too high pressure even with factory ammo? Is there a way to check for a over-sized chamber?
Thanks in advance,