45 Colt ammunition is the round that one the west, and for the most part, the bullet loaded in those rounds was a Lead Round Nose projectile. Lead Round nose ammo for the 45 Colt is an unjacketed round of pure lead. This allows the round to be either soft, or hard cast, each offering different advantages. Hard cast tends to penetrate deeply and resists deforming, soft cast penetrates and deform, as well as expanding.
45 Colt ammo lead round nose is also the most affordable 45 colt ammo and is genuinely preferred for competitions hosted by the SIngle action shooting society. Lead round nose ammunition is preferred for action shooting due to its tendency to break apart and resists ricochets.