I recently picked up a BHP as well, a 1977 version and I find it really sensitive to trigger technique. Unless I'm very careful and very slow on the trigger pull my shots end up being about a foot low at 7 meters. Just for comparison I rented a Glock 17 the last time I was at the range; the same box of ammo I was able to put 10 shots in the 10 ring at the same distance without having to be overly careful about my pull technique.
Is the BHP just very sensitive to trigger pull style, or am I doing it wrong and the Glock was very forgiving?