Just finished converting a Ruger #1 to 505 Gibbs...and thought there might be some interest here. Somewhat surprising was how straight forward the conversion was. The Ruger action is "made to order" for the 505...nothing on the action requires modification. I installed an extractor for the 416 Rigby and it also works fine without modification. I used a straight taper Pacnor barrel which allowed use of the Ruger 458 Win quarter rib..again, without modification. I used a Breako mercury recoil reducer in the butt stock and installed a muzzle brake...gun finished at 12lbs even, and balances just forward of the receiver. I'll post pictures, if I can figure out how.

Otto