inghamtr

I will say this and speaking 'in general' a lot of the 'crud ring' could be related to what might be in your bore... especially when using a hot 209 primer. You did not say what primer you were using so I am assuming a 209.

I am assuming just by your post this is a new pistol. So my first question would be did strip clean the bore? Often the preservatives that company use are a real pain to get out of the bore but they really do need to removed.

Also I have found using synthetic bore oil is far better than using a petroleum based bore oil.

Most often, the 'crud ring' is caused by the heat of T7 burning something in the bore other than the powder. And usually the ring is formed right under the base of the bullet not up the barrel as I think you have indicated.

One other thought, you may find as you shoot and care for the bore in what I will call the proper method the size/amount of the 'crud ring' will decrease.

And as Cayugad has already suggested following his suggestions will solve the problem while shooting.

NORMALLY, while hunting I can shoot 4-5 shots before the 'crud ring' becomes a problem - sometimes even more...