Sgt. Mike
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Here is a update I did a little calculating on two 6.5 mm Magnums against the 7mm Rem Mag and used a online source barrel life calculator done in excel the posted the results into a different spread sheet to see which was the worst barrel burner I used two powder type only that was common among the three cartridges I maxed the loads out per the load data offered by Hodgdon. Here are the results of that estimate…..

CartridgeCase140 gr projectile
H2O grsCC Volgrs H4831cc of H4831% FillvelocityEst Bbl Lifegrs H4350cc of H4350% FillvelocityEst Bbl Life
6.5 Remington Mag684.4543.989%29431200493.681%27801256
264 Winchester Mag825.3554.075%28531221523.871%28291146
7mm Remington mag845.4644.685%29501233594.379%29271252

Darn no clear winner to help make the choice easier. In case your wondering the 264 Win Mag and 7mm Rem mag had the lower pressures than the other 6.5 Mag

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