I've had both slight difference in case capacity and one advantage is RUM headspace on the shoulders and doesn't have the Wby freebore.
I haven't seen any 300RUM brass at our local Sportman's Warehouse but they do have unprimed 300 Wby.
Not sure about magazine length on the Wby but with SAAMI Max loaded at 3.600" for the 300RUM and 3.560" for the 300Wby and Rem magazine length at 3.700" you may be limited on some bullets.
I never used either for target shooting as they just made few range trips between hunting season checking existing loads is all. I don't have either rifle now decided to stay with 30-338mag for bull elk.
Depending on what bullets you may not really gain much over 300Wby/300RUM.
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Vietnam 1965
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