Jon, My only load so far is 45gr of XMP5744, I queried Marshall Stanton of Beartooth if using the Lyman data for the 535 Postell would be ok, he said it was a good place to start. I want to work up a bit higher hoping for 1800+fps, but haven't been to the range for a while, now. PM me your address and I'll send you some to play with. :wink: