[Slamfire]

This weekend I pulled mid range targets at 600 yards. The shooters on my point were shooting F class 6mm PPC. They are excellent shooters, there is a lot more to shooting than the cartridge, but to go on, they shot out the three inch X ring with their last 40 rounds. I got showered with plastic when they shot through the spindles, the marking discs blown to heck, and there were so many pasters in the X ring you could not see the circle anymore.

They did not crimp any of their Berger bullets.

Now come out to a Mid range or Long range match and do that with your crimped bullets.

As for over crimping, just read Lee's crimp instructions. “you can seat your bullets to the best depth and the Lee Factory Crimper will form a cannelure in the bullet as it crimps the case".

Sure reads as though they are recommending cannelures.

Incidentally, I score 100 yard small bore targets with smaller groups than yours.