Funny, you posted the same site link as Sabot Loader and it is that same site that recommends buying the size pack first. And as it says on that site, most muzzleloaders vary between .001 to as much as .004 and with brass or copper solids that will make for a very difficult load with one .002 over what you have. So unless the original poster has an adjustable sizing die or one that matches his bore, I too would recommend the sample size pack first.