280AI or 7 Sherman?

I'd recommend the Sherman 7 MAX.
ADG headstamped brass, fully formed,
Reamers, Dies available. Also custom loaded ammo.

("Son, you know she's a Wildcat".... "I know Dad.. ain't she cool")
The 7 max requires a magnum bolt face. If the OP is looking to build on a standard action (which I assume to be the situation due to the original mention of chambering) this would increase his costs to open up the bolt face or acquire a new bolt. Not impossible or even close to it, but something the OP would need to consider.
 
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