I use Barnes MZ Expanders in 300gr with Crushed Rib sabots in my CVA Wolf and took two deer last year. That was my first year hunting with a muzzleloader. I went out and bought a Knight KRB and it shoots the 250gr Expanders well with the same sabots. I'm just tweaking the powder charge in the KRB. It seems to shoot better with more than 100gr. The Crushed Rib sabots go down "snug" in both the CVA and KRB. I heard you don't want them too loose? I took this doe last year with the 300gr Crushed Rib sabot combo in the shoulder. When the smoke cleared she was laying still on her back. I don't think you'll ever hear anyonetalk bad about the Barnes MZ Expanders. I will probably never shoot at another deer with a slug again.