View Full Version : caliber question

April 19, 2009, 06:26 PM
I just bought a sporterized 1917, but I am unsure of the chambering. I don't think it is 30-06 because the I can't load less than 2 rounds in the magazine.
So, what I need to know is what I can use to make some kind of casting of the chamber, and barrel.

April 19, 2009, 06:39 PM
Is this what it looks like?


Your gun could also be a 300 wby magnum.

April 19, 2009, 06:49 PM
Use cerro-safe, from Brownell's - they have a tutorial.


If you remove your bolt, and insert a .30-06 case head onto the boltface under the extractor, you can see if the face was enlarged for a belted magnum case.

The .30-06 would just fit, but if there's a wide clearance, the chances are good that the rifle's been at least rechambered.

I would also use the Cerro-safe to slug the barrel/muzzle inside diameter.

James K
April 20, 2009, 01:54 PM
Many of those rifles were rechambered and re-worked for .300 Norma Magnum.


April 20, 2009, 10:32 PM
ar15chase, nope, that's not the one, but it did come from gunbroker. I'll try the cerro-safe, from Brownell's thanks

Mike Irwin
April 21, 2009, 09:05 AM
"because the I can't load less than 2 rounds in the magazine."


What happens if you try to load fewer than two rounds in the magazine?

Do they pop out?

April 21, 2009, 09:43 AM
The original .30-06 mag held six rounds and was big enough for magnum cartridges to fit in, so many were rechambered for several other calibers. It should be well stamped on the barrel, receiver rear tang, or the bottom of the magazine. The spring would have to be shortened for fatter cartridges, thus making the '06 fit very loosely. The bolt face would also have to be enlarged and a different extractor installed. Just measure across the face of the bolt. Standard cartridges like the '06 require a fit for a .473" rim, whereas magnums require a .532" fit. The .308 Norma Mag. is about .530".


April 21, 2009, 09:39 PM
just one round won't stay in the mag

April 21, 2009, 09:41 PM
the bore appears to be .30, the only marks on the barrel are standard ordinance marks, but the chamber could have been resmed to something else

Mike Irwin
April 21, 2009, 11:42 PM
You need to measure the bolt face and do a chamber cast to see what you have.

It sounds as if the magazine feed lips have been altered.

May 8, 2009, 12:33 AM
anyone thought of a 303?

May 8, 2009, 12:41 AM
1914 instead of 1917? I'll check that

James K
May 8, 2009, 10:42 PM
You can't insert a standard GI .30-'06 round in a P-14 magazine; it is too long.


May 9, 2009, 03:01 PM
the magazine is long enough for the '06