Greetings,
We have the winner, a badly damaged crown. I am amazed it shoots as well as it does. It looks like damage was done by rough handling. I have no doubt that the barrel is original to the rifle and originally chambered for the Remington short action ultra mag after comparing it with my own rifle. Who knows why. This may have been done some time back as the 7mm WSM has faded with the 7mm SAUM soldiering on in F - class. In any case the rifle is now a bitza but still worth cutting back the barrel enough to remove damage, if required, and re crowning to see if there are more demons from the rechambering. This would let you get some use from your components and dies. Not the answer you were hoping for but it is what it is.
Regards Grandpamac.
PS. The rifle would have originally had a 22 inch barrel. Handloads with projectiles of 150 grains and up would have seldom topped 3,000 fps.
GPM.
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