Designing the 2-diameter paper patch bullet.

[Semtav]

The cartridge behind it shouldn't matter much, other than maybe the wads required. More powder seems to like a wad stack, with less powder a single wad has worked for me. Even with 100 to 105 grains of 1 1/2 Swiss in my .45-90 one wad was all I used. It has to be a HDPE wad in the rifle, but it works.

That's the way my 40-82 was. 80 gr of swiss 1.5 and a single .030 LDPE was all I needed. So far with PP I've used one .030 veg wad under one .030 LDPE wad for all my loads. I'll sit down tonight and see what I come up with.
(Don't know that I've ever used HDPE on anything but my ski bottoms)

I'm not even sure I need a DD bullet for my 40-82. I need to work up a Groove Dia. PP load for it first and see.