Looks like a great rifle. Congratulations!
Is this your first BPE double?
I was going to mention the Berry's bullets too. I've used them in a Westley and they seem to shoot well enough but that particular rifle shot just about everything well - it was a single shot btw.
If they happen to work for you, that's a lot of reasonably priced shooting! Not a traditionally shaped or sexy looking boolit, but very economical.
I have a lot of those on hand if you want to try some out and I will also send you some swaged paper patched boolits in the 350gr range I make to try out.
How are the bores?
I ask, because it seems that old BPE rifles with iffy bores can shoot jacketed (but maybe not plated as the Berry's) better than cast or paper patched.
I just picked up a 450BPE hammer rifle too and can't wait to get it out to see what it likes!