Sorry so late into this John.
I have done a great deal of slug testing (why? why not) and have found that results may vary.
Apparently some sabot slugs need adequate spin to detach the wad (due to the pressures that get them to 2000fps), let alone stabilize them, but some guns shoot them great anyway(>100 yds).
The slugs that typically shoot the best out of rifled tubes are the older BRI (hourglass) style slugs, which also shoot pretty well out of a normal IC choke.
I would try the Breneke(sp?) non-sabot as a good performer, or the Rem buckhammer.
Hey, trying them all might work too because I have a feeling that slight differences in bore diameter may make a difference.
Whatever you do, good luck and good shooting.
Cheers
Tom
