With 2 crude hammer spring adjustments I am getting 25 good shots at an average of 931 fps from a 250 mm barrel on a new, not broken in rifle. If I take time to work with regulator and hammer spring tune I believe I can increase the shot count with the rifle shooting at somewhere around 900 fps. Based on my experience and reading the optimum fps for a pellet for accuracy is between 880 and 920 fps. Nor sure what I'll end up with this stock rifle as far as shot count in .177, but it looks like I'm going to be happy with the shot count.