No, a 270 doesn't
need a longer barrel=--unlike many of the other 65k psi cartridges. A 22 inch barrel with 150 grainers will net you 2850-2900fps with a 270--and that's just perfect for hair-burning range to reaching waaaay out there (in my semi-humble opinion
)
Of course, a 30-06 is great too.
Bottom line: Don't let the 22 inch barrel make your decision--find other reasons.......
Casey