JSB Match Exact Heavy Diabolo Pellets 10.34 Gr .177 Ammunition for seriously powerful air guns. Have you really got a powerful weapon? Then Exact Heavy is the right choice. Heavy. Stable. Accurate. It is being appraised for its low sensitivity for weather and windy conditions. Muzzle velocity is 215 m/s if the power of airgun is set to 16J. Competition grade pellets. Ammunition is tested by 45 meter shooting. The required result after five shots is a center to center of up to 12 mm. Made in the Czech Republic. .177 caliber 10.34 grains Round nose 500 pellets