Has any one out there tried this powder in the ultramag? if so what bullet weights and what kind of performance?

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Growler

Nope. Been using AA8700, which is actually a little too slow for a .338 RUM. I've been using it for some long distance target shooting and my best load to date is a 200 gr Nosler BT, 106 gr of AA8700 and a WLRM primer. This is acutally a book load believe it or not.

Still working on loads for the 300 gr Sierra. Recoil there is substantial. Same can be said of the 250 gr Lapua Scenars. Since I don't have any loads that are pressure tested for those two, I won't mention any loads.

Ram shot makes a powder called Big Boy that is very nice to load in the 300 RUM, they have data for the 50 BMG with that same powder as well.