Navy Shooter,
Going back over the last page of posts, I noticed an implied question about Chamber shapes:
SAAMI and CIP both publish Cartridge and Chamber dimensions drawings for our Reference.
Some Chambers are designed as Straight walled cylinders, usually Revolvers and .22RF types, while others have varying degrees of Taper designed in, usually high power Rifles or intended for Semi-automatic or Full-automatic weapons use. All Chambers also have what is called a Throat, cut forward of the point where the mouth of a Maximum Length Cartridge case would fall, that is a conical area that transitions from the maximum size of a possible bullet down to the Bore diameter of the Minimum specified barrel dimensions.
This Throat is intended to ease the bullet into concentric engagement with the lands and grooves of the Barrel Rifling so they 'engrave' without removing 'chips' from the bullet. A Chamber that is cut with a square end on the Lands WILL cut from, rather than press the displaced metal into, the body of the bullet.
Sadly, I have an old .22LR barrel that was 'reamed' to make the chamber longer so .22 Shot Shells would not 'stick' in it. It Cuts little Lead Chips from each bullet fired from it now, but the Shot Shells don't present an extraction problem when used now. It has been removed and replaced with a properly chambered 'Bull Barrel' this last year.
Best Regards,
Chev. William