1-9 twist as well .15 off the lands.
Try Fed 215s....leave out the M....just incase...I didn't have good results with 215 match...might make a big difference! Cheap to try!ADG brass. I've tried 215M and CCI 250. CCI was the best.
I have changed seating depth. Once I found my node on the latter test I then tried several seating depths