John,

I had my son's 257 Roberts re-chambered to AI the first year Ruger offered the round in the 77. His wouldn't shoot any standard load recipe I tried, and there were a great many.

I sent it to Bob Dunlap, and he said "why not try an AI re-chamber?". He did it as a favor to me. Groups shrunk to about 1/3 the size for whatever reason. confused confused

We also got about 100-140 fps increased velocity, given the same relatively pressure signs.

Back then there was no +P ammo for it, also, and the Bob was loaded pretty mild in factory ammo.

Hunt with Class and Classics

Religion: A founder of The Church of Spray and Pray

Acquit v. t. To render a judgment in a murder case in San Francisco... EQUAL, adj. As bad as something else. Ambrose Bierce “The Devil's Dictionary”