really weird chambers

unspellable · 06-07-2004, 09:09 AM

The usual practice is to make a jacketed bullet the same diameter as the groove diameter in the barrel. In the case of both the 7.65 and 9 mm Lugers the groove diameter is larger than the bullet diameter. (Even allowing for tolerances.) This leaves the question, is the bullet undersized or is the barrel over sized? Based on a few other factors we are inclined to say the bullet is the expected diameter and the barrel is over sized. This for some reason we have not yet determined although we have some half baked theories.

The marking found on some 9 mm barrels indicates the land to land diameter of that specific barrel.

06-07-2004, 09:09 AM	#13
unspellable User Join Date: Jun 2002 Location: Iowa Posts: 768 Thanks: 0 Thanked 19 Times in 11 Posts	The usual practice is to make a jacketed bullet the same diameter as the groove diameter in the barrel. In the case of both the 7.65 and 9 mm Lugers the groove diameter is larger than the bullet diameter. (Even allowing for tolerances.) This leaves the question, is the bullet undersized or is the barrel over sized? Based on a few other factors we are inclined to say the bullet is the expected diameter and the barrel is over sized. This for some reason we have not yet determined although we have some half baked theories. The marking found on some 9 mm barrels indicates the land to land diameter of that specific barrel.