Just how accurate is your Vanguard? What do you expect the Remington to do for you? (I know there is a lot more Stuff available for Remingtons, and when you wear out the factory barrel, you can get a new one very readily, along with a lot of other refinements.)
As said, a short, heavy, stiff barrel is optimum for accuracy; look at benchrest rifles shot at 100-300 yards.
But there comes a time when a little free velocity from a longer barrel becomes an advantage; look at bullseye Target Rifles and long range benchrest rifles.
At "up to" 600 metres (You all there in Arkansas speaking French a lot these days?) it might well be a wash and you could do as well with a 20" barrel as a 26.
Certainly you see a lot of brag items in the gunzines and gunboards about short barrelled tackytickle rifles shooting so fine at long range.
But then my friend, just back from the F-class national championships, 600 - 1200 yards, does not report any such short barrels on guns set up for the distance.
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