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As for the tube, it would be a fun project to hollowpoint some 500-577 bullets and press in a .22 short case. Or, press in a .22 blank and try for an exploding projectile! Might need to hit something like rocks to get it to pop, but maybe not.

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even 300 grains 44 Mag bullets are big enough for 22 long blank but dont do it on short range because of bullet splinters coming back. you can try it before with small pistol or small rifle primer shoot wit a 4,5mm airgun agaist a hard surface.