Doug, I would think almost a full case of 1680, 1maybe start at 12gr. and up to maybe 13.5gr. max. or for even better ballistics, perhaps from Lil'Gun - but not sure where to start with that one- maybe 9.8gr.? Just guessing probably max at around 10.5gr. to 11.0gr.?
I had one .17AH that maxed at 10.5gr. and buddy Brad's Martini used 10.8gr. for the same speed I got from 10.5. My current CZ barrel maxes at 10.2 with WW brass, 10.3 with RP brass.
I think probably starting with moderate loads for the .17AH, then testing from there due to the greater higher expansion ratio for the .20's larger bore.
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Daryl
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