Tested at 100 feet. Listed most accurate first.
Tried Blue Dot, HS-6, Power Pistol, Universal, 231 and TiteGroup for Remington's and Winchester. Loads from Lyman #3. Thrown with Lee Auto Pro.
Rem 147 JHP: Blue Dot, HS-6, Universal. Throw out the flier and the latter 2 are best. Blue Dot compressed.
Rem 147 FMJ: Blue Dot, TiteGroup, HS-6. Blue Dot compressed.
Win 147 JHP: TiteGroup, Blue Dot, 231, HS-6, Universal. Throw out the flier and Universal is the best. Blue Dot compressed.
For Hornady tried Blue Dot, HS-6 and Power Pistol. Loads from Hornady #7. Thrown with Lee Auto Pro.
Hornady 147 TMJ: Blue Dot, HS-6. Throw out the flier and HS-6 is best. Blue Dot compressed.
Observations:
These were all jacketed bullets.
Powder position seems to be a factor. Compressed loads and TiteGroup seem to be more consistent.
Universal is a very good powder except for that first shot flier. I observed the phenomena in other autos and revolvers. Pointing the firearm up will reduce but not eliminate the phenomenon.
Slower powders appear to work better than the faster powders but are affected by the strength of the bullet.
If we include the fliers for the HS-6 and Universal, The most accurate was Rem JHP with Blue Dot. Second was Rem FMJ-FP with Blue Dot. The difference was 0.1 inches and probably insignificant.
If we exclude the first shot flier, the best choice is Win JHP with Universal.
I'm filling this in during a break while I stuff 500 rounds with Blue Dot. After all, the 4th of July is a 3 day weekend and I intend to celebrate in style.