Drew, thanks for the latest update.
The Mec #32 bushing would be the right one for 17.5 grs of Clays, mine throws on average 17.6 grs. on my 8567 Grabber and 17.4 on a 600 Jr Mark V.

Looking at all the loads available with using a Remington hull, 1 oz. shot, Clays powder, Win. 209 primer and just substituting a different wad, he could have been in a much lower pressure and not in LUP, which is not very informative now.

In my opinion, clays is not a large flake powder and I still do not believe it bridged and threw a double load. If that was the case, one shell out of that box would have had no powder and would have left the wad in the bore.



I am just glad that he wasn't seriously hurt.

David