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Here is what Hodgdon had to say on the matter:

Yes, there are perchlorate salts in the combustion residue of Triple Seven. However, there is not a great deal of perchlorate present. It is easily cleaned from the firearm with water.

I would suggest that the sulfur salts present after the combustion of black powder are more corrosive than the products of combustion created by Triple Seven. Tests conducted by the DOD and NASA confirm this.

Our testing indicates that if we use a scale with smokeless powder at one end with a value of zero and black powder at the other end with a value of 100, Triple Seven would be about 30 on the scale. While less corrosive than black powder, it is certainly corrosive and any firearm used with it should be cleaned after use.

The whole argument these guys make is rather irritating as you must clean the rifle after the use of all muzzleloading powders so there is no problem with corrosion anyway unless the shooter is lazy or does a poor job of cleaning.

Mike Daly

Customer Satisfaction Manager
The Hodgdon Family of Fine Propellants
Hodgdon Smokeless Powders
Winchester Legendary Propellants
IMR Propellants
Pyrodex
Triple Seven
Goex Black Powder

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Take care, Tom
NRA Life Member

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