QUICK way, roll up a 3x5 index card and insert into the chamber, see how far it sides in with out due force.

Second way is to use a chamber gauge

Third way is to check the proof marks more closely and then assume it
is 2 1/2 " chamber or even 2 " chamber


Mike

Last edited by skeettx; 02/19/19 01:16 PM.

USAF RET 1971-95 [Linked Image from jpgbox.com]