Throat measurements measure the wear caused by gases burning as it pushes the bullet out the chamber and barrel. 10 is considered max and unservicabe. Your "1" is excellent.
Muzzle wear is cause by GI's running a cleaning rod improperly down the barrel while cleaning. The Army goes crazy on this cleaning crap.
My gage is out in the shop but I believe it goes from 1 - 4, indicating you have a goon muzzle.
Don't get to excited about it. According to the Gage's my M1 should be worn out but it still shoots under 3MOA and is capable of cleaning the Grand target. It just won't do it when I'm standing.
CPT USAR Ret
USAMU Sniper School Oct '78
Distinguished Rifle Badge 1071