Umarex 6mm blanks. Umarex Blank . Suitable for starting pistol. 22CAL blanks we sell using smokeless powder. Pack of 100. 100 per box, Umarex. . 22 caliber crimp blanks which are perfect for use in indoor settings where sound is an issue. 22 caliber crimped blank rounds, manufactured by Umarex, are safe . The Umarex . Please use caution when firing these blanks in 8-shot revolver blank firearms.