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I machined a new percussion cap firing pin and milled a breech plug for a cap nipple so I can hunt with my CVA Optima Muzzleloader in Oregon. I made the firing pin from 440C stainless and the gun goes bang. I'm wondering if I should harden and temper the pin. 440C is pretty tough stuff, as delivered from Speedy Metals:

Tensile Strength (PSI) Yield Strength (PSI) Reduction of Area Elongation in 2" Brinell Hardness
110,000 65,000 25 14 235

I have access to an oven and I ordered some 309 stainless tool foil but I'm not sure whether or not to heat treat.

Any suggestions are much appreciated.

-Cal
 

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I'd go with larry on this one. If the pin shows any peening or bending at some point it can be tempered at that point.
 
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