I'm on my second AI. I've shot 140 grain BT's most the time the last 30 years, but switched last year to 150 grain LRAB's and Ballistic Tips. The LRAB's were real ticky about seating depth and I was able to get better groupings with the 150 grain BT's (.081" three shot group!). My rifle prefers RL-19 in both 140 and 150 grain loadings. In the past, I've used IMR-4831 as my go-to powder, as well as RL-22, with excellent results. I shot out three barrels in my first Jarrett AI culling does (legally). Each new barrel preferred 4831 or 22, with one barrel preferring RL-15...I'm not kidding. My new Jarrett is RL-19 all the way. Have not had a single AI rifle show a preference for either 4350, which I always thought was strange.
Good luck with your rifle!
