"travels4fun"
"blackdiesel"I've figured out the pressure sweet spot for all my Sumatras and when it's shooting at the top of the curve it's just automatic. This past weekend shooting standing with a Caldwell Magnum fieldpod at 100 yards I was able to do a 5 shot group with all the pellets touching. And I'm not a great paper puncher by any stretch. It's a shame that with 500cc of air you can only get about 18 great shots per fill. Someone please make a regulator for this gun.
Well, there is always the external regulator / tethered tank option which would provide you with the optimal pressure with the added benefit of a much larger supply of air. I have been eyeballing the HUMA external inline regulator and a small carbon fiber buddy tank between 12-16 cf. The regulator sits between the cf tank and your Sumatra and can be adjusted to provide the optimal pressure to suit your rifles sweet spot.
Another option would be to tether a Ninja 90ci fill station to your Sumatra. The Ninja would provide 2900 psi regulated output pressure and would give 16cf of air to shoot your heart out.