I am looking for info on a 577BPE using smokeless. I have access to a large selection, Varget, RL15, AC5744, ect.
I have a few weights of cast leads and a few Woodys 650gr BPE jacketed.

Lots more knowledgeable people than me on this forum but maybe this helps. Ross Seyfried has written extensively on Nitro for Black and my loads are based on his articles.
In my Alex Henry 23/4 inch 577 BPE a 525 grain cast PP bullet regulates and goes 1725 fps with 69.3 IMR 4198. Cast powder coated 550 grain goes 1750 with 71.5 grains.Both use backer rod filler , LR primers.
Hope this helps.
Larry

CheifR53,
is there a picture of your AH somewhere?

From Graeme Wright's "Shooting the British Double Rifle" 3rd Edition, page 216:

Hi degoins, I don’t know how to post pics, but pm me and I’ll send you a few if interested.

PM coming.....and thank you.

BPSteve,
I have that same book. I am just feeling around to see if there is anything I may have missed.
Thank you Sir, you have been a wealth of info for me.