Stubble could' ntve said it any better. Proper cooling between rounds (when shooting big hot rounds) is imperative. " Washin out a barrel" can happen to ANYTHING if you bang away in 90 degree heat. If a barrel is anything above " warm" then let it cool. Waiting until it is flatout HOT will just make a trip to the gunsmith that much sooner.

Barrelwear on the 3 calibers you asked about is practically the same and with proper care you will get a lifetime plus from either!
RA