I shoot a lot of 45-70s in my Browning copy of the M1895 Winchester and my 1978 made Model 73 Trapdoor.
To use the sights on the Trapdoor I have to use 45-70 ammo that the sights were designed for. The 405 gr lead bullet running about 1300 fps fits the sights perfectly.
I dont use much black powder in m 45-70s. I use 28 grs of 4198 which matches the velocity of the Armys BP 405 gr load. AND it matches the sights on my Trapdoor. Its a low pressure safe load for the trapdoors assuming the Springfield Trapdoor is in good shape.
Its also an accurate round in both my Browning and Springfield.
There are lots of warnings about shooting smokeless powder in black powder guns. In most cases those warnings are valid. But there are exceptions to every rule and the Trapdoor is such an exception. BUT pressure guidelines have to be followed.
SAAMI says the max pressure for the 45-70 govt. is 28,000 lbs. Quick load says the 28 gr 4198 load develops 12648 lbs of pressure. Well within the SAAMI guidelines. In my Springfield Trapdoor I'm getting right at 1350 fps.
It matches the sights, its accurate and its a pleasure to shoot, even with the steel butt plate.
Few people know that the Army was in the process of switching the 45-70 round to smokeless powder but the efforts were canceled when the Spanish American War caused us to put the efforts into production for the 30-40 Krag ammo.
To use the sights on the Trapdoor I have to use 45-70 ammo that the sights were designed for. The 405 gr lead bullet running about 1300 fps fits the sights perfectly.
I dont use much black powder in m 45-70s. I use 28 grs of 4198 which matches the velocity of the Armys BP 405 gr load. AND it matches the sights on my Trapdoor. Its a low pressure safe load for the trapdoors assuming the Springfield Trapdoor is in good shape.
Its also an accurate round in both my Browning and Springfield.
There are lots of warnings about shooting smokeless powder in black powder guns. In most cases those warnings are valid. But there are exceptions to every rule and the Trapdoor is such an exception. BUT pressure guidelines have to be followed.
SAAMI says the max pressure for the 45-70 govt. is 28,000 lbs. Quick load says the 28 gr 4198 load develops 12648 lbs of pressure. Well within the SAAMI guidelines. In my Springfield Trapdoor I'm getting right at 1350 fps.
It matches the sights, its accurate and its a pleasure to shoot, even with the steel butt plate.
Few people know that the Army was in the process of switching the 45-70 round to smokeless powder but the efforts were canceled when the Spanish American War caused us to put the efforts into production for the 30-40 Krag ammo.