Unseasoned handloader observation/questions:
I went out with the .44 magnum today (at just below freezing) until my fingers were too cold to squeeze the trigger smoothly.
This was the first firing for a batch of RP brass. IMR 4227 launched 240-grainers into some pretty good groups at 40 yards with CCI 300 primers, but I noticed a fair amount of unburned or partially burned powder in the barrel and sometimes the cylinders. These were work-up loads, and I didn't get to the listed max charges from my load data--so the cases were pretty full, but not particularly compressed.
1) Is the unburned powder a function of temperature? I put half a dozen rounds in each pocket for about 20 minutes and there seemed to be less unburned powder when I fired them - but there still was some;
2) Do I really need a "magnum" primer to get it all burned? Or,
3) Should I ignore it - the bullets sure went downrange without a problem.
I appreciate any insights!