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Magnum 150 grain powder charges are supposed to give you a harder hitting, flatter trajectory for long range shooting, right? Well first of all, long range shooting requires ACCURACY. If the magnum load isn't accurate, the flatter trajectory isn't going to help. Second, the magnum load only gives 100-250 fps more velocity so its not a dramatically flatter trajectory anyway. And finally, the US Cavalry was knocking over Volkswagen sized buffalo with 45-70... only 70 grains of powder. You don't need 150 grains to hit hard.

Here's the truth about shooting flatter trajectories: Smaller diameter, longer bullets have higher ballistic coefficients and shoot flatter trajectories. In 50 caliber muzzle loaders, this can be achieved by using sabots and 45 caliber bullets. For example, consider the TC Shockwave 250 grain 45 caliber bullet. Seated in a 50 caliber sabot and loaded over 90 grains of Pyrodex RS powder, it shoots approximately 1623 fps. Zeroed for 150 yards, it is about 4 inches high at 100 yds and 10 inches low at 200 yds. The load itself is an absolute one-hole tack-driver out of a TC Encore, and shoots with manage-able recoil... A 200 yard muzzleloader without a magnum load.

Velocity BC 50yds 100yds 150yds 200yds
1623 fps .210 +3.29" +4" 0.0" -9.87"