Two years ago, I developed loads for 600, 660 and 770 gr. gas checked cast bullets and I shot a few of them with very good success in the 1800 to 2100 fps range with decent accuracy through my relatively short barreled rifle. I I haven't been shooting much thereafter but lately I've been cleaning and re-visiting my reloading area and I found a bunch of the Beartooth, Western, Mt. Baldy and Doudna cast bullets.

The trouble is I can't find my loading data for them. The only powder that I could have used are: IMR5010, SR4759, AA5744 or VV-N165 or N170. I remember too that I posted the loads in at least one forum, but not sure if it was an AR forum.

Anyway, does anyone has a proven CB load for the .50 BMG?

Look up Ranger Rick. He sells cast bullets for 50s, and included load data with my last order(not a 50)

Unless N165 or N170 are equivalent to 4895, then I can't help you, but if they are, I have worked up to 140gr of surplus 4895 in my AR50(with its long throat) and a 735gr bullet from a Hoch mould. Gives about 2200 fps. My tighter throated LAR has a max about 10grains lower. This is with 2/8 lino/ww water quenched.