Along the same lines, this is thechrony measure fps of a sabot without a bullet shot out of a MLer with different primers (same sabot and no powder load every time).Reason, it takes a lot moreheat and volume to ignite smokeless than BP or BP subs. This will make a difference with Blackhorn, which is closer to Smokeless than it is to BP (Goex, Swiss, Elephant).

Most folks that shoot smokeless use Federal or Winchester 209a, nobody uses the Remington Cleanbore or other Lite primers, I recommend they don't with Blackhorn to get good ignition.
Chap