Hi Glockfan, Sorry for the late reply.
I was shown what to do and have stuck with what shown.(Monkey see monkey do lol)
In Australia I've been using ADI powder AP70 which is now obsolete and waitingggggggg on the new APS650.
So this is what i was shown.
3.8grains of powder
28mm bullet length after projectile pushed in.
So I've stuck with that and had no problems. I still have a lot to learn but am not messing with what's working at the moment.
Loving everything involved with the sport