The ammo an Airgunner feeds his AirGun is as important as the AirGun.
I have a large enough stockpile of various types and sizes of AirGun ammo, that I will be shooting for years🔫
H&N and Air Venturi both have great quality copper coated lead BB-caliber balls, which weigh a few grains more, and although the velocity drops, the accuracy may, and energy will be better than with steel BB's.
The Benjamin "cylindrical" .20cal. lead slugs are the closest ammo to the original Sheridan 5mm lead AirGun bullets/pellets available today.
10.85mm carbon steel alloy balls cycle and shoot in the Walther PPQ M2 T4E Co2 pistol, but they cost way too much, and only have a muzzle velocity around 160-70 fps.
The .24cal/6mm carbon steel balls from Germany work amazingly well with the Kel-Tec PMR-30 Co2 pistol, and consistently shoot around 320 fps!
Not bad with a 0.89 gram steel BB!!!
My favorite .24cal/6mm airsoft ammo for Co2 powered airsoft pistols!
At 0.30gram, they are close to the weight of a 4.5mm steel BB.
My favorite 4.5mm steel BB's!! Hornady Black Diamond!!!
RIOT BALL .43cal. 13.3 grain PVC/Nylon roundball ammo!!!
Crosman TrapMaster 1100 Co2 shotgun shells are filled with 62 grains of #8 chilled lead shot.
The spent shells can be reloaded with one .375"/.36cal. lead roundball