But the 45 Colt brass just doesn't have the volume to hold a decent amount of shot (compared to a 410 shot shell). The plastic shot cups are OK, but still not enough. I was going to play with reforming 460 S&W brass with the 45 ACP Shot Shell die to form a brass version of the shot cup. This would have a much larger inside diameter than the plastic shot cups and be half an inch longer than a plain old 45 Colt case..
With the 44TEN, you can easily use 444 Marlin brass and get well over half an ounce of shot (over 220 grains). Taurus doesn't recommend their 45 Colt guns be loaded hotter than a 250gr payload at 900 fps, so you have to watch the payload velocity tradeoff. Lack of load data is a little scary too. I've got my 444 Marlin loads made up with Blue Dot, but I had to guess at how much powder to use (45 ACP load, 45 Colt load). It is difficult because the shot cup is seated so deeply, the pressures can rise much more than what the same power volume would generate in 45 Colt brass with a bullet. But the friction of the shot should be way less than jacketed bullet friction. If I blow up my gun, then I'll know it was too hot...
