Want to PP for 45-70 BPCR

[Rbertalotto]

OK...I'm on the road to paper patching for a Winchester (japan) 1885 BPCR with the Badger barrel. This barrel has zero lead. I've been shooting a 535g bore rider Postell type bullet with fair results. I have two Pedersoli Rolling blocks and a Pedersoli 1874 Sharps and all three of them shoot this same load extremely well. Not sure why the 1885 won't respond.

Here is a chamber cast showing a lead of about 20 degrees and zero freebore.



I've tried many different bullets, loads, primers ets...both BP and smokeless....I've slugged the bore and have an accurate mold that casts 1-20 alloy at .002 over groove diameter. Good enough for hunting but I'm not going to win any long range buffalo shoots with it.

So I want to try PP with BP. Should I ream a throat in this chamber?

My PP mold is .010 under bore diameter. Will this be too lose with two raps of #9 Onion?

Any advise you can give would be greatly appreciated.

Thanks!