Are simply arguing about how many angels can fit on the head of a pin, and deciding that one extra makes all the difference?

Okay, the 375 Flanged is slightly superior in specs to a 9.3X74R. Is there a 'real world' performance difference between the two? This thread and others suggests not. If one really wants to move 'up' in the 366 to 375 range of cartridges to something considered more effective on larger or dangerous game in a DR, then its to a 375 H&H, which usually means a slightly larger and more expensive rifle. (And from what I have read, a 375 H&H is considered about the minimum for buff or other large and unfriendly critters in most areas, including Alaska for the top of that State's food chain.)

Also, if one doesn't handload, or wants a rifle where 'off the shelf' ammo is available in a pinch, the 9.3X74R is fairly common and far less expensive than 375 Flanged (and Hornady is about to bring out a loading that will be even less expensive than current selections in the 9.3)

Theory is wonderful, but let's not get hung up on numbers and forget reality. Dave