We used WW 115 jhp factory. one of my handloads WW 115 JHP, over 4.2 grains CFE seated 1.40 oal crimped to .377 at mouth. I "think" some Remington factory 115 jhp too. Shot some Zeroes 115 JHP, but didn't shoot as tight as the WW. This was a new out of box gun and not broken in. Again this from a ransom rest. For an out of box gun did really well for a start.
I had a Targetmaster 6" bbl, when I first got it used wouldn't hold 6-7 inches at 50 from a rest. Sent it back twice, slide and bbl replaced and got it shooting 3 1/2"- 3" groups at the 50 with handloads. Their customer service with me was great. I think first thing to do with those is replace the bbl. Shame, nice gun otherwise. Oh, one other thing with those the front sight too narrow for PPC, had a machinist make me one. They like to be run "wet" also, I found out.