My Glock-36 will cycle 4.9 Bullseye with a 185 gr Berrys plated bullet. They run about 770 fps avg. low was 745 fps and cycled. It dumps the brass about a foot away so I don't think I could go much lower but it is a nice shooting round.
I'd just bump up the powder grains a little at a time till it cycles the Glock and see how accurate they are.
Another thing you could do is change recoil springs. The Glock 30 and 36 uses a 17 lb spring, check out Wolff springs they offer a 15 lb spring for reduced loads.
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Last edited by bossman; March 21, 2012 at 10:34 AM.