What are the advantages to a short mag caliber? I would be interested in 270 vs 270 WSM. I know there is not quite the selection of ammo and it is a bit more expensive (i do not re-load...yet). I am narrowing my rifle selection down to 270, 270 WSM and 30-06. The gun will mainly be used for mule deer and elk. I do plan on shooting it a fair amount otherwise.