I first started using BD in 1979 using the Speer #10 manual. It lists the following: 125 gr jhp max BD load 15.8gr @1536fps. It was very hot and I had extraction problems in my Model 27 SW. In my Speer #12 printed 1995 the max load same bullet, is 13.0 gr BD @1333fps. Here is the joke??? the min loading in the #10 manual was 14.8grs @1441. what a change! I believe that since so many older manuals are still be used, that the manufacturer has just for safety sake (or law suits) has just covered it all be stating don't use BD with a 125gr bullet.