Challenger Ammunition uses the most modern ballistic laboratory equipment for testing shotgun shells. A universal receiver, combined with an ultra-sensitive "quartz pressure transducer" and sophisticated chronograph system are used to test pressures and velocities. All other parameters are consistently inspected to insure quality control. High tech innovations make their sure-fire primers consistent shot after shot. Slow burning powders offer unequalled performances; very light recoil, and less shot deformation. The one piece plastic wad, whether double or single piston, ensures the shooter with more clay busting and game getting performance. A tubular reducer increase Mfg: Challenger Ammo