Ok, I tested berrys 155gr HBRN 40 s&w with a load of titegroup 5.5 gr with a glock 27 and a lone wolf barrel. I got average speeds of around 1028 fps, which is in the ball park of the speed that was listed for starting load of 5.4 with a jacketed bullet in 3 different books. The question I have is my buddy who used my chrono (the same) for a load with the same bullets but only used 4.7 gr got the same speed with a glock stock barrel, also a G 27. He got his starting loads of the net, no real published data. How was our speeds so close? is the Glock barrel that much faster. OAL powder primer all the same. Not sure if he had a hard crimp on it or anything. I figured with 15% less poweder, it should be slower. Some body enlighten me Wanna kill these ads? We can help!