I am getting leading around the edge of the forcing cone and in the first inch of the barrel.
What would be causing this.
I have only fired 50 rd.
My Load:
New Starline Brass
200gr. Bear Creek .452, Moly coated, hardness 13
7.5 and 8.0 gr. Unique
OCL 1.585
Win. Primer
My Bore is .451
My Throats are .451
What do I need to change