Re: Any 270AI loads
I've got a .270AI in an FN Mauser with a 24" Douglas 10" twist,barrel,and a Timney adjusted to 26oz. The stock is a laminated thumbhole and it has a 15X Bushnell on right now, but when I take it hunting it'll have a 2-7X Redfield that'll work for the long-range I'll do. I put the max range at 400 yards for game.
I've used 130gr Sierra boattails(.020" jump) with 67.0gr of H1000 andMagTech 9 1/2s for 3175fps. QuickLoad predicted 61K for that velocity/load.
64.0gr/7828ssc with 130gr Speer flatbase(.030") and Tula LR primers gave 3120fps
When I used .030" jump with 150gr Sierra boattails and 60/IMR7828 with CCI 200s, I got 3050fps.
The rifle gives me 1.0MOA with all these loads at 100 yards.
I've tried some Sierra 140gr boattails and gotten sub-1" with VV N560 but so far the velocities are only about 3000fps.
The AIs don't show pressure signs as quickly as factory cartridges, so some care has to be taken as the pressures may be quite high before they show up.
That's OK, as pressure is what gets the bullet out of the barrel.
I hope you have as much fun with your .270 as I have with mine.