I've had my .44 magnum for a few years now and haven't done much with it. I'm shooting a Taurus Raging Bull with 6" barrel. I finally started some serious load development to try and find my "go to" load for this revolver. I did a marathon shooting session this afternoon and tried a number of different load combos. My bullets were a 230gr lead semi-wadcutter. My question concerns the powder. One of my combos used IMR-4227, which I've never used for anything other than M1 Carbine loads. I had a fair amount of unburnt and partially burnt powder. Is this common with IMR-4227? Using the same 22.9gr charge, I tried both standard primers and magnum primers and had about the same results with each. Velocity was averaging 1190fps. My crimp was probably in the "medium" range, not light but definitely not heavy. Groups were decent with the IMR-4227 but the hands-down winner for the day was a load with Unique. The Unique recipe ran about 1300fps and had some great groups. If I continue to work with the IMR-4227, can I expect the unburnt powder or do I need to change something?