The Best Speed Loader for Sig P320 Need to load lots of 9mm into your Sig Sauer P320, magazine? Are you finding it hard to do? Have a sore thumb from doing it? Give the Speed Beez P320 Speed Loader a try. Easy to learn how! Just insert the magazine into the 9mm Speed Loader as it locks in and releases the same way as it does in your Sig. Next drop a round into the hole (case first), using a scissors motion will load the round into the magazine. Just repeat until your mags are full. The lever loader gives you the mechanical advantage you're looking for, for your Sig mags.