N320, ramshot competition, clays or ClayDot are all soft shooting, clean burning powders with 147gr. Depending on your OAL and what bullets you settle on, you should be able to load between 2.8 - 3.2gr of those powders listed above and be above 125pf.
My current load is 3.0gr of clays under 147gr bayou bullets. I'm getting about 132pf. 2.8gr got me 128pf. Because Clays is temp sensitive, I bumped it up a smidge to be safe.