Looks like someone else has found a reason to PC.
"Clean-22 uses an exclusive polymer bullet coating to greatly reduce copper and lead fouling in the barrel—without leaving a residue. It also cuts lead buildup in suppressors by up to 60 percent—depending on outside variables. Bullets in this product line are manufactured using bullet-shape geometry that’s been ballistically optimized for accuracy and function. And with dependable CCI priming and consistent propellant, Clean-22 provides flawless cycling through all rimfire platforms including semi-automatics."