Re: ? for the .243 AI guys
The .243 AI really shines with heavier bullets Vs. the .243 Win especially with a 26"bbl or longer. Your rifle should stablize any bullet up to 100-105 grains.
I use 100g Sierra Gamekings out of my .243 AI using H414. Mine is a little pickey and doesn't like full blown loads, It's also a light weight mountain rifle and has a 22" bbl, so I have to use a slightly faster powder like H4350 or H414.
With a 26"bbl you have the ability to use a slower powder. Retumbo, supprisingly would work due to the case capacity to bore ratio. According to Quickload, you could achieve almost 3350FPS using a max charge of 51.5grs which is a compressed charge of 107.4%, that's if you can get it all into the case.
That would be plenty fast enough for deer and Antelope.
If you like fast deer bullets, a Barnes 85g TSX would work well too. I've harvested deer with 30cal 168g Berger VLDs and they work well, but I haven't tried them in any smaller calibers yet.