Any idea what pressure you are developing at 25 pumps?.... That is very impressive FPE in .35 cal, congratulations....I spent some time looking back to 2015 to find the results for the .30 cal Millenniium Pumper, and it topped out at 78 FPE with the 44.8 gr. JSB's at 885 fps at about 2500 psi.... I think that was the most power from a pumper at that time....Bob
Ah, yes. Now I remember. Of course. I was [mis] remembering or mixing up a creator who brazed up a Benji to shoot 30 cal (IIRC). A regular chap on the forums, but cannot remember his name, who also made several neat projects. Forgive me if you read this! Looks like I'll be sourcing some more length of barrel, say, 24-26 inch length.