I also shoot a Black Diamond XR but really do not know what to tell you about the difference in sabots. I just buy the 200 & 250 grain T/C Shockwaves at my local Wal Mart and shoot them with excellent results. When I first got the rifle, I ordered some SST's with a sabot that I could not load. I had to change them over to a Harvester Claybuster Sabot and then I got great results.

After that, I began searching for a good Shockwave or SST and poster Triple Se7en was the one that suggested I buy the Shockwaves with the sabot that came with them. I have never looked back and that is what I shoot, along with a lot of other projectiles...