I have a Model 11 with the Axis style box magazine with the plastic clip on the front that purchased for just the action and trigger so it did not come with a magazine. It currently has a 243 barrel on it but will be swapping that out to some form of 6mm, either a BR or Dasher and so my question is which magazine do I need to find? Can I just use a stock 243 magazine of do I need something else because of the very short case length?