I shoot black Crushed Rib sabots in my Savage Smokeless with .458 rifle bullets, they hold up fine at 2400 fps. They are very tight, and you will have to swab wiht 777 or Pyrodex, but with Blackhorn you will NOT. With the CR I shoot Barnes Origonals 300g and Barnes FlatNose TSX 45/70 bullets, huge hollow point, excellent expansion, excellent shoot thru, the Barnes part number is 45843. The BCR are also cheaper than the MMP by $2.50, so you get a bit better deal. I shoot the BCR with Nosler .451 pistol bullets also, so in my mind they are an "all purpose sabot", much broader range of applications than the MMP line, and less costly. Just my opinion from experience, oh, I have 1 package of nearly every kind of sabot make, and I have tried most in my Omega with various bullets (Nosler and Barnes) with the breech plug removed.
Chap