Question about the BH209 load chart

[tpcollins]

In the BH209 load chart below, the standard 250gr Hornady SST/ML has a lower FPS than the Low Drag sabot. The Low Drag should be smaller in diameter and create less of a seal so how is it showing higher velocities over the various charge range? The 300 gr show just the oposite and is more like it should be. Thanks.

http://www.blackhorn209.com/files/pdf/b ... erdata.pdf

 

[BuckDoeHunter]

I'm just guessing; maybe the bases of the sabots are the same size and provide the same seal. The low drag sabots are easier going in, so they are easier coming out yielding a higher velocity.