Quote:
Originally Posted by RPKESQ
Re-casing is not incredibly difficult, but you will need to learn to do the re-fitting (easing) required as the metal can warp slightly.
Fire Blue is easier than ever. Obtain a temperature controlled furnace and Niter salts from Brownell's. Done.
And better to practice on this .410 than a H&H, n'est-ce pas? 
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I have Oscar Gady's original formula for re-casing but I still don't think it's a good idea unless it has been annealed properly. I have fire blued the way you have suggested, but it's not ready for prime time yet on a customers gun. I'll dink with it this winter.