Saw a lot of turkey in GMU 511 the other day while scouting.

I was told by a guy who teaches the hunter safety courses that you can't use .223 for turkey. Something to do with a minimum of .240 for big game. I told him that turkey is not big game but he said something about some grey area in the regulations where it talks about rimfire minimum and center fire minimum. Center fire min is .240 or greater and rimfire is like 100ft/lbs at 100 yards. The .22lr has only about 90 ft/lbs at 100 yards so the only rimfire you can use is .22 magnum. Maybe .22lr CCI velocitor would work? Anyone have any insight or explanation?