Hence the need to wash the graphite off your heavier (Straight) BBs. The graphite acts like a dry oil, it coats your hop up with slippery graphite, causing you to lose friction, thereby adding more hop up to compensate, resulting in lower fps out of the muzzle.
Overall, from my experience with my M700, if you want max range, don't use anything heavier than 0.30g BBs. The fps will spit them out fast enough to reach the point farther away when the lift caused by hop up takes over from fps. Can easily get 200ft out of a 0.30g BB on propane, even if the temp is +10C. Duster will do the same at hotter temps.
I only cut a couple coils off my spring, Dami, and was satisfied with the results. Was only after that point that I read you CAN indeed adjust the striker spring tension, tried it to find I could only get a 1/4 turn out of it, not worth following.
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