“A wall has a 2 x 2 diagonal support, at about 30 degree’s, a PCC shooter while engaging steel hits the support, see’s wood fly, and the bullet then hits the steel, the R.O. stops the shooter, said it was an REF. Is that really a REF?”
Per the rules, wall supports that are outside the plane of the wall do not exist (184.108.40.206). So, an angled support that sticks out the side of the wall is considered to not exist (just like target sticks) so any hit that travels through the support will count for score or penalty (9.1.7). If the shot traveled through the actual wall and hit the popper, then it would be a range equipment failure (220.127.116.11).