That's too bad that they couldn't help you out with info..
Did they see the photo?
Where did you get these sabots from?
What kind of packaging, were they sold with bullets?
I wonder if they could be the older Knight high pressure sabots.
Do they match the dimensions of the Knight high pressure sabots as listed in Post #11?
http://www.huntingnet.com/forum/3341617-post11.html