What chamber do I have?

[1shot]

I am looking for a reamer print or any other data that you can offer to verify if a 30 cal. Bbl. that I have have is the '95/’97 Palma chamber. I have heard that the same chamber is called both names, as well as there a 2 different chambers . I picked this bbl. up in a multi-part deal, and the only marking on the bbl. Is .308. It is of med. Palma contour chambered and had the muzzle end turned down for a .750 sight band. It measures a true 1-10” twist, but I’m unable to identify the chamber. Any help for someone out there would be appreciated.
Thanks,
Lloyd

 

[kendog]

Here is a JGS Drawing for Warner designed 95 Palma chamber. Looks like the main difference from 308 or 308 Match is the throat length and lead angle. The throat datum is slightly shorter (by .032") than a 308 Obermeyer chamber and the leade angle is 1-45-0 instead of 2-30-0. not sure how either compares to standard 308 SAAMI.

Hope this helps.

 

[wapiti25]

Do a chamber cast using CERO=SAFE and you should be able to see what freebore you have. The throat angle will require an optical comparator to measure it. If you really have to have '95/'97 Palma chamber you should set the barrel back and re-chamber. I would shoot it first.