YOu might take less of a beating using Goex FFg powder, which burns slower and does not create such pressure in the chamber. Recoil is dependant on the weight of the minie ball, and at 410 grains, you are going to feel a good push. The Swiss powder is suppose to be faster burning, and similar to the Goex FFFg powder in pressure. Depending on accuracy, which is always paramount, and then the weight of the gun and how much recoil you can take, you can raise that powder charge up in 5 grain increments to see if you can't find an even more accurate load, with more speed, and shooting slightly flatter. The load you are now shooting would be the equivalent to a .54-70-410 Black Powder Cartridge load. compare that to a .50-70-550 load, or a .45-70-405 grain load. All have enough energy to completely penetrate any deer or elk if shot broadside. Those big conicals will also break bones, if you should hit a shoulder or leg bone. Whether they will expand at all depends on how large an animal you shoot, and whether the ball hits bone. The rib bones on deer are usually too thin to cause much of an upset to these large bullets. If the bullets don't expand, losing energy inside the animal's vital organs, it is likely to completely penetrate the animal and expend its energy in the ground or trees beyond the animal. You should be able to handle velocity of near 1200 fps. with that bullet weight. dThat will give you velicity and energy levels much closer to the .45-70 and .50-70 cartridges provide. Chances are good you will take a shot at much less than 100 meters, so I would not worry about killing a deer, even using this lighter load you now have. If you can buy the slower burning Swiss 1 1/2 powder, which I have read is like Goex FFg powder, try shooting that. You should be able to increase that powder charge to 90 grains, get a bit more velocity, and not lose any accuracy, or increase felt recoil on your shoulder.