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Accuracy can improve - with less barrel whip and different harmonics - or something. Ive never had a deterioration in accuracy shortening any barrel.

Sometimes I've needed to move to a faster...

That stuff they used was factory rated as 3,000 fps so I guess at 18" it would be something like 2875 at best, but as you say a good bc to carry it along.

As I mentioned further up, they used 135 grain factory Federal. On the program they made a point of panning onto the ammo box.

This is it (off the Federal US web site):

Terminal Ascent 270 Win...

Duley et al used Federal 135 grn in the .270 that Derek shot the deer with.

Look at this. With its 18" (or 20") barrel if that's not a gun for all seasons, what the heck is?

Its a .270 - has been for a while. Often referred to. I expect it is to do with being able to display Federal factory ammo on the series. Shorter barrel .270 is a good choice though.

270 or...