Byrna Max 0.68 Caliber Projectiles 25 countOur most powerful 0. 68 Caliber proprietary pepper and tear gas blend: OC, CS all in one shot, with quick acting incapacitating effects, higher dispersion, and higher concentration of chemical irritants than any other round found on the market today, our Byrna Max projectiles are designed for maximum stopping power. Physical Effects: Burning in throat Wheezing Gasping Dry cough Shortness of breath Gagging Inability to breathe Nausea Burning of the