We tried them at mine for about 10 mins. In the end everyone left them off. They do use them for all the other stuff that's shot against plate, but that's lead shot & .22 and .38...
I think care needs to be take with close targets, it might even be time to baffle them. From my experience the splash goes sideways more than directly back. This is reflected in the baffles in my smallbore club.
BFTA/NSRA County Coach
CSFTA Chairman/BFTA Rep