On a BHP, "capacity" is only 13, so in the US (USPSA), Limited-10/minor looks better, otherwise you are going up against 20 round guns with major scoring. Not sure about outside of the US (IPSC). I have a Glock 17 that I shoot in Ltd sometimes, but I also have a +5 extension for one mag, so I get 22+1, which means 40 rounds scored minor with 1 reload.
IIRC, BHP has a magazine disconnect so you cannot drop the hammer unless there is a magazine installed. So you have to carry an extra empty mag, to drop the hammer after "unload-show-clear". However, in USPSA, it is legal to remove such a disconnect in Production Division (just looked it up to be sure: Appendix D4-22.1).