I have a Ruger Mini-30 with an adjustable gas block. This allows me to adjust the size of the gas port. I will load 20 identical rounds. Fire 10 with the gas port open and 10 with the gas port completely shut off and record the velocities. I will try and get this done on Sat. Maybe this will help settle this.

Give a man a fish and he eats for a day. Give a man a welfare check, a forty ounce malt liquor, a crack pipe, an Obama phone, free health insurance. and some Air Jordan's and he votes Democrat for a lifetime.