I have a #1 that was rechambered to 460 G&A #2 a 500 flanged nitro necked down to 45.
All it took was the rechambering and milling a bit off the top of the breach block and the
feed ramp so the rim would clear. The rifle works great and if I could find my old notes could
figure out what the velocity was for the 500 grain .458 bullet. Final velocity was between the
.458 Win Mag and .460 Weatherby Mag. It is a fun gun to shoot recoil is substantial but only
bad off the bench.
Cheers,
fallingblock