ORIGINAL: bdeather
My own experience with the big lead 460grn bullshop bullet last year on a cow with the Ultra Mag is this. Alot of people are saying you should probably use somewhere in the 100-110grns of powder for effective killing power with the big bullets. I disagree I used 80grns of Pyrodex P and the cow was ranged with a finder at 154 yards the bullet did not exit but it penetrated and held together perfectly.
Actually, most of the guys shooting White rifles with conicals use 70-80 gr of whatever powder. Most laugh at RC and I about shooting 110 gr of 777. I didn't have a lot of time toprepare for hunting season after buying the U-M's. I wanted the big bullet to shoot as flat as I could, so I pushed it hard.
I don't know about any other MLer, but with the U-M, shooting the heavy load is not that bad on recoil. Sabotloader witnessed me shoot a few 620 gr Bullshops on top of 100 gr of 777 last year. I was a little hesitant at first, but it wasn't bad at all. My pre-64 Model 70 30-06 is much worse. But, it does have a steel butt plate.