Just did. 5 rnds of 300BO. Seemed accurate out to 100yds for just a quickie. Emptied out CFE Blk from throw, poured in SW-BO, measured out a 19gr load under 125gr Speer, 2.100" COAL. Ran 5 thru Horn-AP. Bang x 5. Primers looked fine. Didn't drag out chrono. Seemed clean FWIW with only 5x. Metered VERY well. Its not as fine as CFE-Bk but its pretty fine.
The shipment just came in today. Had to sign for it. 8# for $144.39, I'll take it. Added some decent .22LR and the $10 hazmat and $7.95 shipping wasn't too bad.
Sort of a quick review.
6PM UPDATE: Did a bit of a ladder from 18.0, 18.5, 18.8, 19.0 Seemed to like the 18.5gr out of a 16" bbl. Nice 1" groups from the bench. Metal dingers with orange paint. 18 was causing accuracy issues. Probably will be able get it tighter with some additional tuning. I also have great luck with the Speer 125gr TNT's when you can find them.