Check my posts in Smokeless In '76 Clones. I use a duplex load derived from 45-70 data. Use 8 gr. 4759 topped with a sufficient amt. of FFg to compress the load. Very accurate, clean, and gives about 1325 fps with a 300 gr. bullet.
Thanks Joe,
I'm aware of the duplex Smokeless/BP loads, I've just never tried them myself.
Several Trapdoor target shooters in my area shoot these duplex loads with (apparently) excellent results.
In my particular case I got one of the early Chaparral '76s in .45-60 a couple of years ago. (I'm on my 2nd one)
I'm using a different bullet than most others here use; mine's a 338g with 3 fairly good grease grooves (but probably still NOT enough)
I tried various loadings of GOEX 2F, GOEX "Ctg.", 5744 and Pyrodex R/S (Pyrodex was a new experience for me).
When the smoke cleared I ended up having EXCELLENT accuracy using the Pyrodex loads.
That's where "things" are at right now.