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A #16 may be a little light for 230gr FMJ. An #18 may be a little better. If the recoil spring was not changed regularly and the firearm was subjected to "full power loads", there could be damage in that area. I would look at the slide near the dust cover to see if there are any hairline cracks or other evidence that the dust cover was hitting the frame.
If there is any marks that look like the slide was hitting, please take it to a smith for a checkout before shooting.
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Former President of the ECPT (Eifel Combat Pistol Team)