I don't know if you would save anything by buying them seperate, but Hornady is about the most cost effective you can go with a sabot. Around $9 a box of 20 I think, with the sabots. I would do some research and see what loads work best with that rifleling. I think a 1:48 twist favors a slower bullet compared to the newer 1:28 twist guns, thats why they shoot so well at higher volecities. Heck high powered rifles have like 1:9 twist rates for really fast bullets.

I will do a little research. I was reading some stuff on it a while ago, I just need to find it again.

Paul