Full length sizing a case most of the times makes it 0.004" (or more) shorter than a go-gauge so this will not work. Unless you only feed it full length sized brass that measure the same as the one you used as the go gauge. and no other ammo will ever fit in there.
Factory ammo will be closer to go-gauge length.
If you have a headspace comparator or a case bump gauge you can use a once fired piece of brass as a no-go gauge. Then bump the shoulder 0.003" of another once fired brass and use it as a go-gauge.
Otherwise you need the proper go & no-go gauges. Or use 1 or 2 pieces of masking tape on the head of the go-gauge and use that as a no-go-gauge... 1 piece of masking tape = 0.002"
If you're really set to do it asap, Factory ammo will do the job ... but disable the trigger by any means for safety sakes.
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