I wanted a "smaller" reloading project
Congratulations on a beautiful rifle! I'm sure it will give you good service. Be sure to check which chamber you have; they came in 2 3/4" and 3". The 3" chamber is preferable as it matches the .577NE brass that is available.
After I got my Adams & Co. .577BPE, I reached out to big double afficionado, Cal Pappas up in Alaska. He hooked me up with some brass, bullets, and a load recipe.
Cal wrote to me:
"The load that will work in your rifle is 40% of the original black powder load using IMR 4198.
I would guess your rifle will shoot fine with 60-65 grains of 4198, a pinch of kapok pillow stuffing to keep the powder next to the primer, a rifle magnum primer, and a bullet of <600 grains.'
I found my rifle shoots well with 650 grain Woodleigh softs and 65 grains of IMR 4198 topped off with a tuft of Dacron pillow ticking. Cal got me some of his 590gr cast bullets and they shot just as well as the Woodleighs.
I worked up from 60 grains of IMR4198. My particular rifle is fairly light for caliber at 9 1/2 pounds. Those initial loads are easy to shoot with light recoil, but didn't regulate well. Rounds from each barrel landed on the same plane, but 5 inches apart. As velocity increased, that distance decreased to a respectable spread at 50 yards. Full power loads are not uncomfortable, but you do need to be hanging on when the hammer falls
Hope you are able to get your Rodda running soon. Availability of brass, bullets, and dies will be a challenge...
My .577
Ed Z