Need a joule wizard to explain something to me. I understand what joule creep is, but I am wondering how a gun can use heavier ammo and NOT get any joule creep. In my BAR 10 sniper rifle with hop on, I shoot 2.66 joules with 20s (535 fps). I shoot 2.68 joules with .40s (380 fps) Thats practically nothing. Most the guys at the local fields have an advantage over me with moderate amounts of joule creep. Why is mine not benefitting at all? I was under the impression EVERY gun gets joule creep when using heavier ammo because the bb stays in the barrel longer.