This long distance shooting stuff is all new to me. I never thought I would ever be shooting anything over 100 yards. Mostly due to the fact that all my life, all I ever herd was that the 44-40 was barely a 100 yard cartridge. Well we all know that the black powder loads can touch 100 yard targets with ease and even group 30 shots inside a 4" circle as well as knock over steel javlina @ 300 meters.
I have been able to get extremely close with smokeless powders but had to go a tad over 11,000psi max.To extend that out a bit farther, both yardage and pressure wise, I worked my way up to a 260 yard, high pressure, smokeless powder load for my Marlin 1894CB
Using a healthy load of IMR4227 and a 240gr SWC cast bullet, I reached out and touched an iron weight lifting target a few times at 260 yards. After several shots I snapped a quick video. I really didn't think my phone would capture a clear enough video or I would have left it running a few more shots.
It may not be graceful, but at least I don't have to stay on the porch any more :-)
44-40 Website - https://sites.google.com/view/44winchester/chasing-the-44-40