This is what I found, which is great, sounds pretty much like the 375x338 Win:
"A joint development between Hornady and Ruger, the .375 Ruger is a brand new case based on old case dimensions. It is a rimless case with rim and case body diameter of .532-inch, exactly the same as the time-honored rim and belt diameter of the .375 H&H case. Except that the .375 Ruger doesn’t “step down” ahead of the belt, so it starts out a bit fatter in the body, and has very little taper.
Kept full-length (2.8 inches) it would have greatly exceeded the .375 H&H in performance and would have been roughly similar to the .375 Remington Ultra Mag. This was not the intent; instead the case was chopped to 2.5 inches so it would fit into a .30-06-length action. The goal, therefore, was to equal .375 H&H performance in a “standard” (.30-06) case length. This would give Ruger a powerful and versatile cartridge that could be mated to their standard Model 77 Mark II action."
I do not think you have to wait to see if this will work or not. If you have a Classic Mdl 70 in 338 that needs a new barrel, there you go...
Ed
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