Thanks Mike....it isn't my first trip around the barn, it's just been a whlie since I made it....lol! Thank you for the info on finding the dimension of the straight rifling. I'll give it a whirl.
I was pretty sure I could size the .427's down and that the lube grooves would disappear if I did. Biggest thing right now is I have no die close to .415. I believe I have a .410 in the box that might work and I know there's a .406 for my 40-82. I'm making a list of things I need and a sizer and bullet mold top the list.
Let me ask you what your opinion is of rehardening the brass, how its done and the purchase of correct loading dies. Old habits die hard.
I only have one mold for my 40-70, a Lyman that casts about 408-410 grs. from my 25-1 alloy. I fear that is just too long and heavy. When I bought that mold for the rifle it shot so good I never tried another. MOA out to 600 yards satisfied me....I probably can't see that good these days....lol!
Oh well, this journey will contiue for several months...and I'm looking forward to it.