3 inch steel cannonball? Or similar size?
this isn't for a cannon, but needs to be strong steel. Could be a large ball bearing.. whatever. I've been looking online, but can only find lead balls or old civil war iron balls.
It really isn't all that hard to do.
OR.....If you pay for the expences and Materials I will cast you one myself, and then, you can arange for the shipping etc... That is as long as you can tell me what you intend to do with it......and I can believe it .
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