I have an R Corbin swaging set up. The bullets I use are flat based, tapered, pure lead for paper patching. The final step where the core slug is taper swaged into final form always leaves a small, irregular knife edged flange around the bullet base. Yes, the base punch to die fit is excellent. But the high pressure final swage of the pure lead still leaves that tiny, nuisance flange around the base. For paper patching that is a real PITB! Have been using a simple Lee chamfering tool to remove it but even that is not the best. Seems to roll the sprue edge about as much as it trims the small, thin edge. Anyone else run into this and if so any slick ways or tools to lightly and cleanly chamfer that flange from around the bullet's base???