I have a Lee crimp die in the last station on my Dillon press it tightens up the group (even neck tension) stops projectiles moving out of the case when the bottom of the magazine is never reached because it is always getting topped up. Crimping for me took out the variables and gave accuracy in well used battle rifles. The HTs and Ts show the same tendencies adjusting the die while testing showed some very interesting things. My go to work rifle is a No5 has to be crimped just like the Military Ammo.
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