I like 223AI but it isn't for everyone. It gives me another 100+ FPS out of a 22" barrel, which really shows at distances beyond 600. Fireforming is easy, just shoot 223, and accuracy is pretty close to the real thing so you can play on steel. The biggest thing I like is that I don't have to keep trimmming the brass once formed like you do with 223.
Okay thanks for that. I’m thinking that for the next barrel I’m going with a 26” heavy varmint or medium Palma profile. But it will be 26” to ring out a few extra FPS. Based on your points above the only down side I can see is needing to buy another set of dies. I usually shoot my 223 within 600m-700m with 80gn Berger Full Bore projectiles, some more horse power May not be a bad thing.