Sharp Shooter
As you know I am not an avid conical shooter, so I really can not give a lot of first hand information. I have shoot the 460's with 100 grains T7-3f down to 60 grains of T7-3f. Beside the recoil going up a bit i really did not feel that I was getting that much boost to the efficiency of the bullet with those higher levels of powder, anyway the chronograph was not showing much change. When I mentioned this one time on DWB's several people indicated they were surprised I was getting any kind of accuracy with anything above 70 grains... From what I was reading into their replies or thoughts was they were surprised that I was not creating slippage across the riflings in the projectile - therefore down grading accuracy. I really didn't think I was, but those guys know awhole lot more about shooting lead than I do,so I have compromised I am shooting 80 grains.
If UC (underclock) picks up on this he and his knowledge bank can provide you a bunch of information.
One time when I asked Doc White about it - he told me I could shoot 120 grains and one of his 600 grain conicals from his White model 97, but the accuracy would be degraded - never did do that, but I think Cdad has shot 110 grains with those big lunkers.
Most of the guys on DWB say 70 grains is plenty for everything with those big conicals.