Originally Posted by Saltydog235
Powder charge consistancy, type of powder then choice of bullet and seating depth.
This, without question after you have done this:
Originally Posted by mapsjanhere
optimized custom powder charge for the gun in question
Definitely those two.
Overall consistency in every detail is critical no matter what, though. What geetarman is saying is exactly that: Consistency.
That applies to shooting, too. Every detail consistent and repeatedly identical every step of the way.
Did I mention consistency? Anyone else mention it?!