I had Bullberry make me a .22-250 AI bull barrel a few years ago for my Encore and I dreaded the thought of having to spend $$$ and countless hours fireforming. So I just loaded them up with a "10% under max" load and went to the range. The groups came in at 3/8" at 100 yds. Consistantly. So this was my starting load for my first hunt with this caliber.
Just try a few regular loads and see what size groups you get. Might be good enough for hunting.