I am not sure I am totally getting your problem other than a small barel and a wide inlet. I have built and bedded many rifles in my life and when I do bedding I generally mix black dye with the compound and it looks pretty good alongside the blued steel. I go to a Masonry supply store and buy some of the black powdered masonry dye, mix a little with the epoxy and go for it.
Good luck on the project. I learned the trick from the late Harry Lawson of Lawson gunstock company in Tucson.
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