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300 wsm barrel length?

My WSM has a 26" tube, and keeps 178gr. AMAX's supersonic to just about 1500 yards@ DA of about 6-8000 ft. It really depends on which bullet you want to run and what powder you have behind that bullet. If going with a short barrel, like say a 20", you might look into 155gr Scenars, with a Varget load. IMHO, going with anything under 20 to 22" is going to be a no-go because of excessive muzzle blast.
 
28" minimum IMHO. if you want to shoot 1000 and maximize your performance I would stay over 28" go with 190 or heavier bullets and go to town. I have a LOT of experience with the 300WSM and shooting 1000 yard competition and ground hogs.