Here's my final tune... Pellet: JSB Jumbo 15.89gr 30 round sample Regulator: 98 Micro 2+22 Valve 5+5 FPS low/avg/high: 893/911/926 with 19 of 30 rounds between 909-917 Air usage: 1.875 rounds/bar, ~280+ rounds per tank Very happy with projectile energy, spot on accuracy and low air usage...