Yes all sabot tests were done in 45cal SMLs. They shoot very well though in several 40cal SMLs sabotless. Even a relatively slow (for 40cal) barrel. So the twist is not the problem. They were also shot in a polygon rifled 40cal barrel with good results.

CEB will make pretty much any bullet you want. Thats how this bullet got its start. A couple people on a smokeless forum had them make it.

Its my opinion that if they dropped the weight down to....220gr and used a ogive similar to the Barnes 195gr they would shoot in sabots. The BC though would suffer a great deal.