I'm thinking of possibly putting together a 6.5-06. So would a 26 inch barrel be best for velocity or would it be just fine with a 24 inch barrel? My goal would be to shoot 140 gr. bergers out of it. Also would there be any barrel harmonic problems with a #3 contour barrel at 26". Why I ask is I see Shilen recommends a finished length of 24" for their #3 contour. Thanks!