Re: Accurate 9mm loads?
My experiments with making an accurate 45acp rifle led me to have; a Shilen bull barrel, a very tight chamber*, ammo resized again after loaded, 230 gr Montana Gold FMJ bullets, and very hot loads.
I can get 20 rounds rapid fire inside 4" at 100 yards.
Accuracy with 185 gr bullets is terrible. I don't know, but suspect, that there needs to be a lot of bearing surface on the bullet to keep the bullet center of gravity centered in the bore. Otherwise, the bullet tips, and centripetal force throws the bullet randomly off course upon exiting the bore.
*I cut the straight wall chamber within .001" of the size the brass comes out of the sizing die.
I throat the chamber to fit the bullet to be used.