There’s an important consideration when loading the newer low volume/high energy powders along with correspondingly smaller MEC bushings numbered in the 'teens. It’s possible to get an overcharge of powder in a 12-gauge hull if you're inattentive or get flustered while clearing a jam, and particularly while using a progressive press. If you accidentally dump extra powder into the hull the wad column can compress and the crimp will look about normal. Yes, as our old familiar powder inventories get depleted we start to use what's available nowadays. Just be extra careful gents when loading with these modern powders and smaller bushings to get the powder weight drop per the published recipes.
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