I have a 7x57 on a Type 99 Arisaka action, and I have it a long time. Over the years I bought and sold a lot of rifles, but the rifles that have been good to me I hang onto. It works well on those "medium" actions that were mentioned. .308 cased cartridges are difficult to get to feed properly and you do not have to mill the receiver as with the longer cased cartridges. I am lucky with the barrel I used (surplus 7x57 Mauser carbine)as it shoots equally well with 140 Gr. or 175 Gr. bullets. I always keep a box loaded up just in case I am heading into rough cover where I need a short fast handling gun.
