i can sit at our club range and see the ones that are OVER LOADING their barrels with powder.if there is snow on ground.you will see the powder in snow 10ft out in front.i used to put a white sheet down and test it that way to. you would be surprised at the people that are putting to much powder in their barrels.some got idea that more powder,the better.its money wasted going out barrel and i think pressures are high to. question,where is 3f in comparison to 2f in grains.i like that pick idea in vent, good one. what wheel did you use on the dremel tool to knapp the flint,i have one and that sounds like good idea too. you got me interested in trying the roundballs again in my t/c hawkins .50cal.take care