Make sure the szing die is screwed all the way down to the sheel plate. CHeck your expander dia, make sure it is not more than 0.354", smaller is better. Overcrimping can cause less neck tension, as you bow the case away from the bullet. Check your brass, some brass is thinner than others & w/ 0.355" bullet, you won't get proper neck tension, regardless of how much crimp you apply. Crimp just finishes the handload, it does NOT hold the bullet in place.
"Given adequate penetration, a larger diameter bullet will have an edge in wounding effectiveness. It will damage a blood vessel the smaller projectile barely misses. The larger permanent cavity may lead to faster blood loss. Although such an edge clearly exists, its significance cannot be quantified".