Re: Marlin .22, anyone know this model?
As to the 'greased' part, Peters made tons of .22 ammo in the OLD days. I have shot many bricks through three different rifles back then. Peters ammo did make comment of 'greased' on their boxes.
The projectile had a coating of what I would call wax or parafine (sp?) on it. This was to lube the bore.
It was fine to shoot, but if you carried rounds lose in your pockets, as we all did back then, you got pocket grit, dust, etc. on the ammo. It felt 'ickey' then, and we usually wiped the rounds to clean them off before loading.