Matt stopped making them so I was able to get in on the group mold buy over on the CastBoolit Forums from Mehic.
Start off with 5.0 grains of Unique and work up...I used 7 or 8 I think and it was in the 1300s...needless to say it comes apart...
Bob
i didn't chrony mine but probably around 8 grains. I think that is a good idea to slow them down some. Next time i load some that's what i will do. I know they go splat fired from a marlin rifle.
