If I had a bunch of 200 grain bullets, I suppose I would use them up. Or, if they were lead, I could just recast them to the proper weight. I'm done with light bullets in the 45 Colt. I prefer a 255 grain home cast bullet. If I do use something else, it's usually a 300 grain bullet which works pretty well in the Marlin's 24" barrel, grouping acceptably at 100 yards. For rifle loads, Unique shoots accurately, however, AA-9 and IMR-4227 are preferred as they will yield higher velocity. For a truly magnumized-version of the 45 Colt, I know a lot of folks use H-110 or W-296. But I don't like those powders in this caliber since they are better suited to higher pressure calibers like 357 and 44 magnums. They can work OK if loaded right near the maximum allowable pressure for a Ruger Blackhawk and such loads will work as well in a strong rifle. The Marlin is at least as strong. However, I think they made the chambers a little too large to facilitate feeding, and thus, from my rifle, the fired cases are always noticeably bulged. That doesn't make me want to run it at pressures quite that high and besides, AA-9 and IMR-4227 are a lot more flexible, especially if you need to run at pressures that will still be compatible with a revolver of less strength than the Blackhawk.
