like I said Bart to me the proof is on the target, theorize to your hearts content but I am getting results on the targets so I must be doing something right. Funny thing is my reloading procedure is dead on simple and my tools are bargain basement with the exception of my sizing dies (Redding or Whidden bushing dies) which I consider the most important part of the process
the way I check my neck tension is simple and fool proof. Size a case , measure the OD of neck, seat a bullet, remeasure. That is my neck tension if there is less than .003 expansion on the second measurement I go down another .001 on the bushing until I get a minimum of .003 difference. Ever see a bullet that has been sent down a barrel ? That rifling gouges bullets a plenty. That is why I like to buy use blems. I don't sweat the small stuff. When I miss the ten ring 99% of the time it is me not judging wind or mirage right, not the bullet or rifle.