A longer barrel seems to really get a few more fps out of a standard 30-06.Playing with different powders also makes a big difference in velocities too.I was working on some loads on a 23" Rock Creek barreled 30-06 a few weeks ago.I found 55.5grs of Big Game,Win Case,WLRM Primer,168gr Nosler Ballistic Tip gave me 2955fps.That same load gave me 2985fps out of my 24" Sako rifle.That same load out of my 28" Pac-Nor barrel was 3043fps.

~Molɔ̀ːn Labé Skýla~
As Bob Hagel would say"You should not use a rifle that will kill an animal when everything goes right; you should use one that will do the job when everything goes wrong."Good words of wisdom...............