Product description of the H&N HP Slug .218 21gr:
HP = Hollow Point
The H&N Slug HP is a pellet which differs significantly from the usual pellets due to its bullet shape. It‘s designed for powerful rifles which can shoot such projectiles precisely at targets at 50, 100 or even 200 meters distance. An extremely favorable ballistic coefficient (BC) ensures a flat trajectory and excellent energy retention. To accommodate different barrel profiles and power levels, we offer options in diameter (.217 cal. / .218 cal.) and weight. The muzzle energy of the rifle should be at least 25 joules, but for best results we recommend 40 to 60 joules.
Calibre : .22 cal.
Weight : 21 gr
Minimum Muzzle Energy : 18.5 ft.lbs
Max Distance : 100m
Head size: 5.53mm
Suggested for : Small game hunting/Plinking.