The Army marksmanship unit that often win high power national matches have their AR's throated to touch the lands on a 80 grain SMK with the bullet quite a ways out of the case,"real long" , and they seem to do "OK", when seated to magazine length,"huge jump". When I was working up a slow fire load for the 75grain bthp Hornady for slow fire, I move them out to touch the lands and gained very very little, so I went back to the same load for rapid fire. Moving the bullet out will not always make them shoot better. Also the way yours is, might be ideal for the 75 grain A-Max for long range varmints.