I, also, have a Remington Model 41 Targetmaster, from the '30's. In the mid 50's, I stripped it down, polished ALL the parts & blued it myself, in a HOT Commercial Blueing tank & it still looks NEW!There are gun shops that still do hot blueing, but it cost considerably more than cold blueing. I stripped the rust off my Remington Model 41 Targetmaster and used G-96 cold blueing. It did a very nice job. I rubbed it down with ATF as soon as I rinsed off the blueing. I used my Milwaukee heat gun to preheat the gun parts before I applied the blueing.
Can anyone recommend someone that still does the actual blueing on the spark plug iron bases?( not the blacking that is mostly done now. ) Thanks , Norm