That could be the problem. I only set it about 4-6' in front of the muzzle. I used to set it out farther, but had a minor " accident" when a WonderWad decided to fly downward right out of the barrel. I guess since I' m not using the WonderWads any longer I could move it back out. Might keep me from blowing the sky screens off now and then with the magnum charges too!
I' m just plain hard on equipment I guess.