[Nick_C_S]

I'm leaning toward totaldla's thoughts on this.

Yes, in a perfect world, there would be zero barrel leading.

I can't think of a day of shooting with my 1911 where it didn't come home with some leading (unless I was shooting jacketed/plated that day). The breech always has a little buildup.

I take a brush, scrub it out, and move on. I never considered it a problem. It's certainly not effecting accuracy, that's for sure.

Yes, there may be ways to improve the OP's leading condition. (I was thinking of either loading a little hotter; lowering the BHN - if that's possible; or using HS-6 - because it burns cool.) But how deleterious is this "problem" to accuracy, etc? How important is it really, in terms of the big picture? Are we striving for perfection for perfection's sake?