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It's really not that big a deal. Just shoot them with muzzle in a plastic bottle. Or press the muzzle into some polystyrene and shoot them. Very uncomplicated thing to solve.

Or just press them...

You can do two things - you can size the cases and press them out like normal - (absolutely no problem doing that, I do it all the time. Hundreds of them. (I have primers that have been pressed out...