TC Seneca Breech plug unsafe?

[Turtle]

Pyrodex-now I know why it corrodes worse than black! I have replaced 2 barrels ruined by the stuff.
 Does any other available powder have that bad nasty stuff in it? Great info- thanks
                                                 Turtle

[Daryl]

Black Mag3 and another has potassium perchlorates as well, I've read.  The MSDS sheet on T-7 says it does, but monk says no, that Hodgdon used the same MSDS sheet for 777 to make 'things' easier.
There was one or two others as well. If I had to use one - I'd probably use T7- however, that time is not here.  If you live in the States, you can order BP & have it delivered to your door - no excuse for not using real BP.

[BOB HILL]

So much for the accuracy of MSDS sheets.....Bob

[Daryl]

Exactly, Bob.