Designing the 2-diameter paper patch bullet.

[beltfed]

Mhearth
INdeed, the length of the "patch to FF case I.D./groove" band
depends on the chamber. If you have little or no freebore
a shorter base band is appropriate so most of the bullet starts out
well out on the lands. And provides for more powderspace in the case.
Usual gg 45-70 chamber has none or very little freebore and so
one can have a bullet with only a short base band.
My 40-72 gg chamber has no freebore and so I have only a 0.125" base band on my latest mold for it. So I can get 85 gr Swiss under the bullet. But, I am now thinking--- ahead?--- that maybe a slightly longer base band, mayb e0.150-0.175" might be a bit better for
a better "hold" in the loaded case.
beltfed/arnie