Gary,
Why not trying to get a substantiation for switching over from Cast Steel Shot towards SCCW shot (high hardness) ? I also had always lot's of problems with my newly bought Cast steel shot and went over to SCCW shot and got full approval of the Aircracft Engine OEM to use it always where-ever Cast Steel shot was mentioned. Since then (1994) we never had any issues anymore around shotmedia quality and related shotpeen-problems with our computerized shotpeen machines and shot sieve systems.
Marcel
