You slug w/ a dead soft lead bullet that is over size. Lube it w/ case lube or such & drive it thru the bore, chanber first if possible. Measure thehigh poitns, that is groove dia. Add 0.001" for a lead bullet MINIMUM.
Bullet fit is #1 but alloy comes into play as well as bullet lube & the powder you use. Where is the leading? If it's early, then the bullet is too small or too hard for the pressure used. If it's at the end, the bullet lube is failing. If it's all along, then could just be a rough bore or a really small/hard bullet & low pressures.
Drop the water quenching. Clip ww are fine for any sane 9mm load. Quenching makes them so hard, you have to drive them hard to obturate or size tehm larger. Even 0.0005" larger will matter when it comes to leading.
"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".
Last edited by fredj338; 12-26-2012 at 18:28..