Re: 1" or 30mm for a .308
Yup! My Vortex Razor HD has 125 minutes of vertical and horizontal travel in its <span style="color: #FF9900">35mm</span> tube.
Agree though, tube diameter is no something you shop for. Look for reputation and quality, the reticle you want, matching knobs, and enough elvation to be able to dial up to your longest distance (typically 1K yards) all more important than tube diameter. As has been pointed out above, most scopes in this area have 30mm or larger tubes.
Vortex, Nightforce, S&B, Valdada, all good choices. I'm sure I forget some.
1911fan