Larry
I am at work and do not have the 270, but I do have other "standard" barrels, and I do have the 223 bull. I can tell you without doubt there is a big diff in the muzzle dia of a std barrel vs. a bull.
My bull is about .990 at the muzzle as opposed to about .65 or .70 for std. Maybe someone with the barrel on hand can give actual measurments for ya.