This is what I am afraid of…that the problem with my 20 grain slug is not the setup of the rifle but the rifle itself…honestly it is hard for me to fathom that my rifle is just too easy to setup with ample headroom for velocity tuning using 15 grain slug but became impossible to velocity tune with 20 grain slug, while at the same time I am reading people on the net tuning 20-30 grain in bigger caliber with no problem at all on bone stock M3. I have heard many posts claiming that FX M3 is just not made to perform with .177 which my dealer insists only applies to the first and second iterations of the M3…. I have Huma Air hammer tuning set and huma air spring set on order, if these mods still couldn’t produce good result I think I will just avoid the black hole altogether and just upgrade to .22 setup for the M3…15 grain slug just doesn’t produce satisfactory hit for me, too lightweight…
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