Do a search for the plunk test. This is an important part of OAL when loading for an an auto. The rounds have to also fit in your mags. Suggest a few dummy rounds to check function in your shield. All the powder manufactures have websites with recipes. After dummy rounds, load a few, and start with their starting load ,check operation. If they cycle and eject your good to go. If not add add more powder. Never exceed their max published load. Have fun be safe

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Jim McGhee