I like IMR 800X for my low pressure loads. Fed. Gold medal hull, windjammer wad, cci 209, 1 oz. of shot, under 5000 psi. Never had a blooper either despite people telling me I would. I've shot these loads in -10 degree weather with no problems. My only complaint is that the powder is not very clean burning, always leaves alot of residue in the tubes. Not a problem with double guns, but might suck for automatics (which I dont think the low pressure would operate them very reliably anywhoo).

Dustin