I have owned a Savage 410 double barrel for years and have had a lot of enjoyment with it. My youngest daughter has used to shoot trap with and all of the boys were putting down their 12ga magnum cannons and asking her if they could use her 410. Probably her devious female ploy at work any way.

This site has the Tap Magic for stainless steel. I have purchased from these folks and they are good and quick. The product number you need is 8705T63.
http://www.mcmaster.com