Out of the 100 rounds loaded 10 suffered setback when they hit the feed ramp and gun would jam. Pulled the 10 setbacks very easily and measured the bullet diameters. All measured less than 0.400, couple were at 0.395, Measured some Berry plated TCs that 0.401 and some Xtreme 180s I have on hand are at 0.400 Question is can I crimp these skinny rounds tight enough to prevent set back without messing up the case mouth headsspacing in the barrel? Brass was a mixture of range pickups. Anyone ever have problems with skinny bullets from any maker?