Not sure on the forged or cast, but I had the same concerns. I recently was hammering with all my 225 lbs against a 1,100 lb piece of 1-1/4" steel trying to straighten some metal. It didn't seem to hurt the maul in the least!
Truper 16-Lb. Cast Iron Post Maul

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- Wider striking surface than typical sledge hammer
- Cast iron head has higher vibration damping capacity than other metals
- 36in. American hickory handle provides strength, durability and vibration dampening
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