Hi all... I recently started working up loads for the 107 matchkings and 75 grain V-MAXES using IMR 4831. I started within loading manual recommendations and found decent accuracy. I had not yet had a chance to chronograph anything though. Afterwards I had a chance to run them over the screens and was shocked to say the least. 41 grains under the 107s netted 2620 fps and 46 with the 75s barely broke 3000. I was expecting at least 2900 and 3400 respectively. This is out of a 24" 1-8" twist McGowan barrel that's currently got a little over 60 rounds through it. Anybody run into a barrel that slow compared to published data? Next step for me is to see where pressure is with this powder and just what it'll do.