Being a more dense material it would definitely be a better projectile 
However, 
I do not think the toxicity of lead was any way relevant to it being a projectile material. 
 
The Romans used lead acetate as a sweetener for their wine and lead containers for their drinks, this would imply they had no knowledge of the lead toxicity 
 
Regards 
 
Ken
		 
		
		
		
		
		
		
		
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