I use nothing but WL liners and we all know how they look on the inside. But I also lightly cone them from the outside. Everyone.
I started doing this after modifying some factory liners to make them faster and more reliable, and the results were so good I still cone the outside.
My reasoning is this: Some of these factory jobs have a screw slot that blocks fire from the vent. I used a ball mill to open up the slot just so the fire had a better chance of finding the charge. The results were amazing. Of course I did things to the inside also so in total the effect was satisfying.
So I figured it wouldn't hurt, and might help, to have a small cone on the outside to help direct more fire into the hole.
I have fired thousands of shots through different rifles and calibers and I notice no increase in fouling with an outside cone on a WL liner.
Sorry guys, but you can't reason me out of this. Results talk louder than words or theory.
