I would use the Bullseye you already have. Use the minimum listed load you can find in published data and load a small batch. If they don't cycle the gun, you only have a dozen or so to deal with. You could even mix them in with workable ammo for malfunction drills.
I like 3.5 Bullseye with a 125 cast bullet. It cycles my Gen3 G17 perfectly and is very accurate. I wouldn't go that light with a jacketed bullet as they can stick in the bore and that is bad, very bad. A cast bullet can run at lower charges and not stick in the bore.
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