Triple 7 corrosive?

[Myerslake2005]

I know black powder is corrosive, Pyrodex less corrosive but still corrosive, American Pioneer not suppose to be corrosive, how about Triple 7?

[lonewolf5348]

Pyrodex is more  corrosive then real BP,triple 777 I done 2 days before cleaning my fired  inline and seem it was o.k. I find windex best for cleaning up triple 777.

[Redhawk1]

From Hodgdon's web site:
Q. Is Triple Seven corrosive?

A. No propellant on the market is completely non-corrosive. Triple Seven does not aggressively attack steel like blackpowder but, as with any firearm, we recommend cleaning as soon as possible after shooting. Triple Seven has proven to be less corrosive to brass than other muzzleloading propellants.

http://www.hodgdon.com/tripleseven/tripleseven-faq.php#corrosive

[simonkenton]

BlackMag3 was advertised by the manufacturer as non corrosive. I noticed that Cabelas did not call it non corrosive. I bought a pound of it to find out for myself. I fired one shot from my cap and ball replica pistol. Thank God, I ran a patch down the bore, before I let it set up for a month. I had rust all over that one cylinder and the hammer. Took me about 3 hours to clean it up, the action is still a little rough.

[slave]

I have found a light surface rust down on the inside walls of my Encore's frame before. If  I do not push the pin and tare it completely down to get it completely cleaned I have seen this from one shot and a week in the safe. Always cleaned the bore and plug the same day and never seen any signs of rust. Only shot 777. Mine is SS and I find it strange the blued componets like the hammer, springs and such inside the action show no signs of corosion.