HI,

BIG SAM, I have talk to you before and you have help me with some loadS with the 416 rigby.I would tell you from what I have found out to go with the 45-70, as if you handload them they will be as hot as any 450. I would say use good brass, starline and if you have a newer lever no problen. The brass will be less and if needed you can alwalys get 45-70 ammo.Handloaded 45-70 and 450 are really the same, KEV