First shoot the gun and physically measure with a Feeler Gauge. Measure your End-shake also. If your End-shake exceeds .003" then you can correct it with Ron Power's shims and that in turn will also widen your Barrel Cylinder Gap. You will have solved two problems with one solution.

If your End-shake is not in excess, then you can either live with with the .002" -.003" and just clean the Cylinder face a little more than normal if it is sticking. You can also polish down the Forcing Cone .001" - .002" but this must be done carefully so that it does not become uneven and favor one side or the other. If you are not comfortable with doing so, then let a Professional GS do it. It's not a big job and should not cost much.