I have a 300 wsm
that used to be a .308. Rebarreld with 24" and shoots like a dream with 168gr Bergers at 3100fps across the chrony. ( Of course the bolt had to be redone to accept the wsm case, sako extractor added...etc...) But I like the way it shoots and the little shorter profile. I dont think you will go wrong with a 24.