Just loaded up 40 rds of once fired Winchester 45-70 brass (trimmed, annealed, sized) with newly acquired Swiss 1-1/2 powder.
Twenty with 62 grs and 20 with 65 grs. The 62 grs don't look like there won't be much compression needed with a thin card and lubed felt wad under the bullet.
I'll find out later today .....