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if you go with a hower action your excluding all us left hander. If your looking at 10-20 actions, the go a full custom like Stiller Predator so left hand is an option. The other action to consider...

I looked at a short 284, but you need to push the shoulder back 0.25 to get similar cap as 308. So capacity somewhere between 284 and 308 would work. Problem is you will want to use Lapua 6.5*284...