To go with a short-mag type cartridge you will have to get a WSM Push-feed style bolt head. You will also need to change out the mag box to make it a repeater of course. You could also do something like 358 Winchester. For a short action round it looks like it should have a nice thump factor at normal hunting ranges. A 338 Federal would be another to look at. However to do a 338 Fed. or a 358 Win. you will need a .473" face (308 sized), which is more common and should be easier to find and of course a 308 sized magazine.