Along same lines as @308 suggestion. T simple pair of pliers have a semi round grippy bit before cutters.wonder of you cut/ground a set down till only thin bit left you could have two curved jaws say 2mm thick than punch inwards...a gentle squeeze,half turn and do other two sides and no more movement perhaps.my understanding is you want firm grip on projectiles and minimal working of your brass,was thinking side cutters themselves but would be to fiddly to get it even,then saw the bigger pliers with grippy hole closer to pivot...which also makes me thing of the adjustable pliers...
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