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Yup forgot to mention that you can form brass into a heap of rags in town even, as long as you don't set them alight.
Certainly quiet enough if you have enough stuff to muffle the blast😆

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You can use a fast pistol or shotgun powder.
Work up like you would a normal load until you get a sharpish well formed shoulder.
It will not be perfect like using a projectile but it will be well...