Maybe is twist rate... Cedric in his hmr .172 needed a 1-9 to stabilize 24g .. we are trying to shoot 20g from 1-17.7 ... is a big gap from almost 1-18 to 1-9In my Maverick with the 700 mm barrel, pushing upwards of 1100 FPS.
I have not tried to shoot any of the slugs at slower speeds, the shooting i did on Saturday with my Vulcan 3 the 16 grain was under 900 FPS as i recall,,,,, i have gotten a strange fetish with clearing the last shot string in all my weights in the FX chrono.
Actually just looked and my 20 gr string was still there.
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