Buffalo Arms is the best supplier I've found for cases and dies. For the 45-75 there are two die makers, 4D and RCBS. The RCBS are pretty high at 200 dollars plus. I was told that the 4D do not work for every rifle, whereas the RCBS dies do. I've not used the 50-95 but have shot my 76 SRC in 45-75 a decent amount. The cartridge originally used a 350 gr bullet and you would be advised to stick with the 300-350 gr range for accuracy. The 76 is not a particularly strong rifle, nowhere near the strength of the 1886 rifle. I'm not sure if you were planning on using blackpowder or smokeless. If you use smokeless, tread lightly...