I think the "Partitions are bad for doubles" is an old wives tale, that keeps getting repeated. I know several people who shoot them in doubles with no problems whatsoever. Also, the rib came off after the Simmons repair, while shooting factory Norma ammo(non H-style). I shot Partitions after the Champlin repair, and the rib stuck to the barrel like bark on a tree.

Granted, I wouldn't shoot mono-solids in a double, but Partitions don't worry me. The 9.3 in particular, as it still has the old style relief groove cut over the partition.

Jeff