When I had FAC air running at 29 ft lbs, I used Daystate 16grn pellets, but I used to wash them, dry them, sort them and take out and bad ones, then lube them. I was getting 1/2” groups at 50yds.
Yes, the cleaning, sorting and lubing cycle (which took about 30mins for a tin of pellets) made a huge difference to the grouping