Matt:
The best way is to take the gun to a competent gunsmith and have him measure the chambers for you. Any decent bloke will do it for free. Otherwise, get a Brownell's chamber plug gauge or Galazan leaf gauge (about $30 and good for gunshows etc.)
Finally, if you shoot low pressure/velocity loads with tapered case mouth construction (like Win. AA or Rem STS), you should have no problems in good barrels. You apparently have found this out already. Of course you can certainly use the shorter cartridges.
Best, Kensal
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