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murraywc 05-18-2010 02:04 AM

size of unmarked rifle
I found several rifle barrels with recievers and bolts in a rental house we owned one was a 03-A3 one was a G33/40 one is a rather large barrel with no markings the bore is .253 and the chamber appears to be a 25-06 what is the best way to find the size. One of our local outdoor centers suggested either take it to a gunsmith or just try a 25-06 shell in it, if it will chamber that is it because it is the largest of the 25 cal shells. Any suggestion.

Dr. Marneaus 05-18-2010 02:11 AM

Take it to a gunsmith or do a cast of the chamber and have it measured.

murraywc 05-18-2010 02:20 AM

what should I do the cast with? and what about the 06 being the largest of the shells?

robocop10mm 05-18-2010 01:49 PM

The G-33/40 is a small ring Mauser action originally intended for the 7 X 57 class of cartridges. It may have been rebarrelled to .25-06, but IMHO this is not a truly "safe" conversion as the .25-06 has higher operating pressures than the 7 X 57.

Have a gunsmith make a chamber casting with Cerrosafe to get the answer.

c3shooter 05-18-2010 04:19 PM

As Robo said. Cerrosafe is a low melt temp material with unusual properties. After it cools it shrinks- so that it may be removed- and then- miracle of miracles- returns to it original size, so you can use a micrometer to accurately measure it.

Although in a pinch I HAVE plugged the bore, pounded lightweight aluminum foil into the chamber, pushed it out and measured it. But Cerrosafe does much better.

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