Personally, I don't think that there is a right or wrong length for a barrel in CF. But, I do have a opinion on RF (can't prove it, of course
).
I think in RF that a long barrel can have a advantage. Because that the amount of powder is so small and fast, it's shown that a 20" barrel can burn it, most all of it. I
think that the additional barrel can act as a stabilizer and a dampener for the bullet, plus it does lower the muzzle pressure that acts on whats left of the blow out, to groove base band.
Makes since to me but, whether it works or not, I can't say.
Going back to CF, I've thought for the last 10+ years, that muzzle pressure
can have a effect on accuracy, with our soft bullets and that is
maybe why the Miller Short seems to have a overall, slight advantage.
That group and score killing, one or two fliers
could possibly be a damaged base, on exit?
My vote is for long barrels. 28" minimum, I have two 26" and two 30" (rest are 28") but, my 45/70's have been 32".
Frank