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I recently installed a Huma regulator into my wooden flashpup. Standard plenum size, not the XL. I've been seeing guys getting 830fps with 25.4 grain pellets with the reg set to low pressure like 120 or 140 bar, and the hammer spring only a few turns out from home. I was able to average 825...

I'm shooting .25 cal pellets at around ~810. My flashpup has gone from 1" groups at 35 yards to 3" groups" at 25 yards. Before everything went to poop, I did two things: Shot about 15 cleaning pellets, but without using ballistol. I also may have forgotten to tighten the hammer-spring grub...