Re: load data 300 win mag &280A.I.
For the 300 I'd try rl22 with 165(78 gr.) or 180(75 gr) grain bullets or h1000 with 190's in win brass with a 215. For your 280 ai, I don't load for that one(see log in handle) but my brother uses rl22 with 140 noslers and it is great in his regular 280. With only a few percent difference in case capacity, it should be great in the improved too.