I just built a 280AI, really the goldilocks of the bunch. The 7saum and 280AI are basically ballistic twins; but you can find 280 brass anywhere to fireform or just buy nosler 280AI brass up-front.


7saum brass is unicorn status right now


I would start by looking at what bullets you want to use, then go to what velocity you want to push em' at. Combine that with the practicalities of each cartridge and the answer will be clear to you.


I went 280AI. Magnum performance, more or less, without the hassle, noise, recoil, extra powder, and I can easily full length resize. Plus an extra one in the belly, so I can shoot one more critter whistle
Also it is one level deeper on the tinkering stage to keep me occupied. FWIW

The factory of the future will have only two employees, a man and a dog. The man will be there to feed the dog. The dog will be there to keep the man from touching the equipment. � WARREN G. BENNIS