Doug S
Doug this is my opinion and what I practice with all of ML guns, inlines or sidehammer.
T7 is far less corrosive than any of the Pyro's or real BP + it is much slower to corrode when it does... if it does...
First I will tell you that I am very proud of my ML's and the condition they are in at any time you might picvk one up... but..... I do not strip clean or thouroghly clean then every time time I shoot them + plus they could be loaded for weeks at a time.
T7 is the only powder I shoot and is the only powder that I would consider doing this with.
Just prior to the season, I will take the gun out that I think I might use for the up-coming season. I will test fire it 3-5 times to check POI. I believe all of my guns fire more accurately on a fouled barrel, at least a semi fouled barrel - I will explain this...
After the gun has been test fired - I will patch the barrel with 3 damp regular windex patches (both sides) then 2 dry patches, and finish with a Slip 2000 (lightly oiled) patch - the wipe the barrel again with 2 dry patches. The barrel is not "clean" - it is semi clean and it is very lightly lubricated. I beleive the windex nuetralizes T7 perfectly and the light coating of oil also protects the barrel in the rotten northern Idaho weather.
I have used this same routine for at least seven years now shooting T7 and I do believe it is very effective for me. Any barrel can rust in the bore if the bore is not protected. T7 in my mind is not anywhere close to as corrosive as some would have you believe.
These are my results - you might find it different - but for me it works great
mike