If you are good with a set of micrometers and such, You can get some "cerro-safe" and do a casting of the chamber. Or you can do it the easy way and take it to a good gunsmith and tell them to do aa chamber casting. In some of the custom rifles of long ago they would bore the rifles to diffrent calibers than that was on the barrel. The good smiths would stamp the correct one on there. Ill so some research for you in my library and see what I can come up with. I have not heard of a 6mm scott though. Ill search and see what I can come up with.