ok here goes, I hope this helps. Use Jarrows inletting black (you can get on Treebone carving and maybe track of the wolf on the internet, or prussian blue (oil Based) artist paint in the tube. I use a toothbrush to apply it on the metal, USE IT SPARINGLY VERY SPARINGLY!! I put small bolts through the Butt plate screw holes bolted down for handles on handling the Butt plate as seen in the picture. I will brush the inletting black on the metal and use the handles (small bolts) and push it on the wood, pull the BP off and look at the marks that are left. I take the dremmel and remove the blackened part of wood. Then repeat and repeat and repeat. When your done you can take acetone to remove the final black marks. When you are almost done you can use scrapers to do the final touch to get the perfect touch thats another topic. If you use a small rubber mallet to strike the butt plate on to the wood, be careful and only strike the bp lightly, just one time per a try at each fit. Don't double strike because that will give you false impressions.
Im a member of the Gunmakers guild and have been stocking since 1994. The only reason I said this is maybe to give some validity to my post. Inletting a steel butt plate sometimes takes me 3 to 6 or 7 hours. They can be very time consuming. But very rewarding. It just takes time and patience.
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