The Firing Line Forums - View Single Post - Sticking Chambers S&W 940 9mm What To Do?

ribbonstone · November 25, 2006, 01:03 AM

The only thing that would stop my 940 from working was when using on popular brand of +P ammo...would back that case up tight against the recoil shield, stopping rotation. Probably reason was the very smooth chambers...with so little grip on the walls, cases tended to piston back tightly against the breech.

So I'd not try for a mirrom smooth chamber; that would seem more likely to stup rotation. Too rough a chamber (like yours) and you'll nearly break your hand getting them to eject. Believe you're reached the happy median...just rough enough to retard case set back, but not too rough to let you eject.

November 25, 2006, 01:03 AM	#18
ribbonstone Senior Member Join Date: January 29, 2006 Posts: 179	The only thing that would stop my 940 from working was when using on popular brand of +P ammo...would back that case up tight against the recoil shield, stopping rotation. Probably reason was the very smooth chambers...with so little grip on the walls, cases tended to piston back tightly against the breech. So I'd not try for a mirrom smooth chamber; that would seem more likely to stup rotation. Too rough a chamber (like yours) and you'll nearly break your hand getting them to eject. Believe you're reached the happy median...just rough enough to retard case set back, but not too rough to let you eject.