You don’t “tune” the GK1.
My GK1 being an UNregulated version, 'tuning' involves adjusting the power-level to the fill pressure you're going to be filling to. Otherwise the power-band/shot-counts will suffer. As demonstrated in my testing notes-
18.1gr FX, tuned for 250 BAR fill, 19 shot p-band = 842 / 887 / 45 / 14 / 863 / 30.0
18.1gr FX, tuned for 310 BAR fill, 23 shot p-band = 912 / 942 / 30 / 10 / 930/34.8
21.53gr JTS, 250 BAR fill, 19 shot powerband= 791 / 850 / 59 / 14 / 27/32.7
21.53gr JTS, 250 BAR fill, best 15 shots of the powerband = 821 / 850 / /29 / 10 / 834 / 33.3
21.53gr JTS, 315 BAR fill, 21 shot powerband= 870 / 894 / 24 / 6.3 / 882 / 38.1
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