USPSA Production limits you to 10 rounds in a magazine. The magazines can hold more, you cannot load more than 10. Round count max on a stage is 32, so you need 4 minimum. But always have a spare, so 5. Not unusual to have 6.
I suggest you shoot a match and not wait for your gear to be perfect. If that means loading the G17 mags full and shooting Limited instead of Production, then go for it.
Have fun!
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