I actually use Bore Butter for my large conicals. Just put a pinch between your fingers, and rub your fingers together. The heat will warm up the bore butter and make it very soft. Then I just rub a little bit on my bullet as I am loading it in the rifle. Works great, and not much of a mess.
I also size my bullets but on my BP bullets I do not lube them in the lubri-sizer. I just apply a touch of Bore Butter at the time of shooting.
Are you guys sizing those bullets?? Tom.