I have a Rem 700 300 SAUM, and a Ruger M77 MkII 7 SAUM....purchased at least 300 pieces of brass for each and can't remember when I last shot a factory round in either. The only other rifle I had at the time was a 308 Win, and the SAUMs were the reason I started reloading....and tinkering with stocks, and bedding, and chronos, and powders.......

So if you are going short mag, you really should be reloading.