The last barrel I ordered from Mcgowen was a 24" 308 barrel in a light varmint/heavy magnum contour. The muzzle diameter is .750", and it is NOT a 2-taper barrel. It is a straight taper. I dont know if this is a standard available contour from Mcgowen or not, but this is what I told them I wanted and they had no problems giving me that.Their CS was very good to deal with over the phone.

I am sure if you want a Shilen barrel that they can do it in whatever contour you want as well. They're just a phone call away.