And the plastic cleans right out with solvent. If solvent doesn't help on a patch a ball of 4/0 Steel wool saturated with it on a brush on a long rod will especially when spun by a drill. Polishes and cleans fast.
Cleaned a few hundred plastic coated bores in my gun shop when I had it.
Not a Pedersoli, but I had a Mowry single barrel 10 guage for awhile. For some stupid reason I thought I would try some balls in it. Shot quite well, in fact much better than it did as a shotgun. But it put a hurtin' on the shoulder and cheek. I remember my right side molars aching for a week afterwards.