I got my package of 50/.458 (45-70 rifle bullets) MMP sabots today. I was able to get them to slide down the A&H's, the Remington, and a TC Green Montain 50 cal sidelock barrel just like they were made for those barrels. I was using a Hornady .458 350 grain RN bullet.
I will try shooting them this weekend for a group and I will get a couple of shot over the chrono also. I will start at 80 grains t7 and work to 100, through one of the A&H's.
Anybody have any thoughts on these loads and what I might expect for a velocity?