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Pyrodex is incredibly corrosive. You have to clean the gun within 3 days of shooting.
Triple 7 on the other hand, I have intentionally waited 2 full weeks after shooting my revolver. Finally I got tired of looking at it and the thing cleaned up 100% fine. I don't know how much more time I could have given it and you miliage may vary.

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T-7 has the same "active ingredient" as P-dex does according to my friend who is an acknowledged expert in the field.
It is covered by the same patent or so I am told.
It is less active than Pyrodex but will do the same thing only in a little longer time frame.
Leaving a gun 2 weeks with BP will cause "frosting", micro pit, if the humidity is over 30% and might even do it at less RH if left that long. I cannot imagine T-7 doing any less.
The thing one must remember is that the stuff does not have to create red rust to cause damage so finding no rust is not a sign there is no damage.

Dan

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