I'll be the odd man out as I like thick skirt hollow base bullets. I find them very forgiving when reloading over powder fouling as in hitting to the same Point Of Impact. I have a few rifles that will not group flat based bullets to the same POI as the first clean barrel shot if I reload over fouling like in a hunting situation. On the target range I don't mind swabbing between shots but not when I'm hunting. I liked the now defunct Buffalo Bullets super thick base skirts, the Lyman 542622 and Lyman 533476 (modified to drop .541"). In my four .54 caliber rifles only 2 of them( Lyman GPH & Knight LK-93) will shoot a flat based bullet to the same POI over powder fouling in a hunting situation. But they will all shoot to same POI whether the barrel is clean or fouled with thick skirt hollow base bullets like the previously mentioned Buffalo Bullets, defunct Hornady GP, and Lyman's 542622 & 533476. Why this is I have no idea. I have experimented extensively with the two that won't shoot a flat base to the same POI with a clean barrel and a follow up dirty reload (a rebored from .50 to .54 Rem 700 ML & T/C Renegade) with no such success. Fiddling with powder charges, using felt wads, card wads, combinations of the 2, failed to work.