I just found the Speer .45 LC shot capsules from Midway so nothing is stopping me now. I have been loading pistol round shot shells for as long as I can remember. In my SBH .44 mag I can kill running rats uo to 20 feet when I load up with #6 or #4 shot, few pellets but very effective. I've killed over 100 rats this year with them. Back when folks would let a man rabbit hunt, I've been known to kill running rabbits with a .44 mag stoked with shot shells. The best dangerous snake load is #12 shot if you can find some. At 6 feet this load will put a tiny pellet in every 1/8 inch. I only use these when someone has actually seen a bad snake in close. (yeah, I know they ain't gonna hurt us, and their more afraid of me than I am of them, but I won't put up with copperheads in my barn or woodpile) I guess my favoite load is #6 for rats. We raise fowl and often have problems with coons, skunks and rats so shot shells is the way to go. I shot a coon sow at over 15 feet last month and stopped her in her tracks with a head shot of #6's from a .44. I give the shot shells more credit than most, I've seen cat(s) killed better than 20 feet from .45 ACP shot shells. (lucky pellet perhaps, but still dead, several)
Rick