Years ago I read from Paco Kelly that he would use thick poly glued on base of some flat base boolits. If memory serves correct it was the old lyman 280-300 gr boolit for 35 whelen. My question is has anyone done this and must the boolit be kept in the neck for this application and did it lead. I prefer to learn from others before I try something that might produce leading in barrel. I do fire a flat base jacket seated backwards every 20 round of cast like he said he did and I don't have any issues with leading.