I have been running Berrys HBRN 124gr in my M&P full size 9mm. I use 4.0 titegroup with a 1.100 OAL. Easy shooting and accurate.
I couldn't tell you if the HBRN reallly makes any difference, but like you wrote, it makes sense......???????
I've been trolling for awhile and thought I would introduce myself---hey there, I'm Ed...... I am a huge gun fan, enjoy reloading, and the NFA game. Lots of great info here and hopefully I can add to the knowledge base....????? It could happen