Ok 20 feet isn't that much. That's what? 7 yards?

Really depends on what kind of backstop you have behind the plywood. I have been nicked over the years and a few times drawn blood from shooting at steel plates intended for 22lr but not everyone reads the rules and shoots rifles or large caliber pistols and it dimples up the plate. That can cause fragments to come back at ya too. I'm quite sure the reloads, timing/pistol had nothing to do with it.