Manolito, I have an original Rigby Model No. 4 built in 1921 for the 350 Rigby Magnum. I load Bertram Brass with 225 gr. Woodleigh Weldcores to about 2675 fps and it is a delight to shoot with minimal recoil. This is a great caliber that exceeds 35 Whelen ballistics and approximates what the 338 WM can do in a great old cartidge that should not be allowed to die.