What would you do 7mm….20” mid length Saum or Long PRC for the 180s

I'd say the answer is in mag length? I have a 7saum and 7-08 (both in AR's). I chose the saum over the wsm due to restricted length ans wsm would suffer requiring the heavies being so deep. I'm sure your question has to do with ba's. Don't know what gain possibilities the prc will give you over the saum, but who doesn't want that extra fps!
 
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