sharps 74 40 70 load

[ken s]

I have an original 74 Sharps sport.rifle 40 70 SS
load is 330 Brooks PP
64 1/2 Old E. comp. 1/8
060 walters
CCI LR Reg primers
MAG causes the cases to stick because the primer backs out slightly.so I prefer the reg primers that do not

I've ordered a Brooks mold
330 RN 3 grease grooves .403 original bore and the bullet will be .409 that Steve recommended to bump up and fill the grooves. I want to fire it unsized.
I want to try the Grease groove bullet that became so popular in the mid 1880s.

Any thoughts on the mold? I can still change things.
Any thoughts on the load and compression amount?
Thanks..Ken