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You can defy physics😆

Look up 10m, 15m and 20m velocities of both lead and steel shot of equal charge and weight.
Then explain how you halve lead between the 2 please.
Bare in mind a good lead...

Sorry mate but that is not very good advice.

Steel may be faster at the muzzle but by the time it has gone 15m it slows down drastically as does lead.

Target aquisition, locktime, speed of...