Dan Wesson Specialist- ramped barrel to frame wear marks: normal?

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I have a 10mm DW Specialist and I love it. Shoots great, functions fine. While cleaning I noticed wear marks on the frame in the area near the link pin. Based on the angle and location it appears to be the edges of the barrel ramp rubbing on the frame. In an unramped barrel (45 ACP) you would not have the ramp moving as the barrel tilts and rotates thru the firing cycle. So this would be unique to a ramped barrel IMO. The barrel and ramp fit look as good as you could get it and there are no gouges on the ramp edges. Can’t be but a couple thousands gap (I didn’t measure it) between the inside of frame and barrel ramp. I am not very experienced with 1911s. I have about 700 rounds thru the pistol. I may have asked this before but didn’t associate the cause (barrel ramp). Are these wear marks normal ?