It's less forgiving then pyrodex? Yes it is. How much? Are you meaning how long can I go before I have to clean my gun and start to worry about it? Well if I shoot it I clean it, no matter what kind of powder I am shooting.

All these powders, no matter what they advertise will sooner or later start to work into the metal of your rifle. The question is how long do I have? That question is effected by, What kind of humidity do you have there? What kind of temps? Do you swab between shots? How many times did you shoot that day?

I'm not going to say, go ahead and shoot T-7 and then not clean your rifle for three days. What I will say is, its your rifle, do what you like. If it were my rifle, I'd clean it if I shot it, no matter what.