ive had a jugs and a stalker 2 both at the same time stalker was 1 to 2 mph faster most time jugs@89 stalker@91 but i've taken the 61mph tuning fork and it read 61 on both gun plus an old stalker. so now i think it has to do with range of the gun and cycles per second and those could be affected by the power left in the battery. your angle from the release point will lower the velo readings as will shooting between a tin building and metal light poll haha! found that one out first hand. id say you can trust either brand