If you want to use non-toxic bird hunting ammo in your older gun designed for lead shot, check out Hevi-Shot's Classic Doubles shells. This 12 gauge example is a 2-3/4" shell loaded with 1-1/8 oz of #2 shot, which it launches at 1150 fps.
Hevi-Shot Classic Doubles are denser for knockdown power at greater range, stronger to retain pellet shape under set back ignition forces, softer surface hardness for greater safety in older firearms, deeper penetrating because they don't deform, and also feature higher performance with each shotshell buffered and sealed to ensure world record patterning and penetration. With weather resistant crimp.
10 rounds per box. To buy a full case, order 10 boxes.
Ammo price is per box