A Bartlein #3 is the same as everyone else's #4, their #2B is everyone else's #3. Even fluted I think a #3 Bartlein will get too chunky. A 280 AI on a remington I'd be tempted to do a 2B at 23" as someone mentioned. Heavier usually shoots better but a great lighter barrel screwed on by a great gunsmith will shoot plenty good. A #2B still isn't light, it's plenty heavy to shoot well.
I don't do long barrels on hunting rifles anymore, too little gain for the weight & handling sacrifices.
