Lead bullets require lubrication to prevent them from depositing lead in the bore when shooting. There are many types of bullet lube. Traditionally, a stick of hard wax bullet lube is used in a lubrisizer to lubricate the bullets as they are sized. It's a bit messy, but the lube works well. For less mess and lower cost, tumble lube bullets using a thick liquid bullet lube. This works best if the bullets have tumble lube grooves or micro bands. Instead of two thick drive bands on the shank and a thick lube groove in between, bullet molds designed for tumble lubing have a few smaller drive bands with a few smaller lube grooves between them, providing more surface area for the thick liquid bullet lube. The tumble lube process is simple. Dump the sized bullets into a plastic container and add a blob of liquid bullet lube. About a teaspoon is sufficient to lubricate 200 bullets in the 9mm to 10mm range. Put the lid on the plastic container and shake, rock & roll until the bullets have a uniform coating. This only takes a minute. Pour the bullets out on an old cookie sheet in a layer one bullet deep to dry overnight. With tumble lube, the sticky lube is applied to the entire bullet and not just the lube grooves on the shank where it's needed. This makes handling the bullets a bit messy when reloading ammo, and loading ammo at the range. Sprinkling a teaspoon of powdered mica over the bullets will help keep the bullet lube on the bullets.