Maybe one way of dealing with the varying alloys would be to do a displacement and measure the volume of the ball. This, when taken with the weight, should point to a different alloy (ie, David's specific gravity).

Silas Hurry
HSMC

-------------- Original message -------------- 
From: david G Orr <[log in to unmask]> 

> Both Dan and I have found musket balls using pewter in the 
> lead . I also found pewter scrap in situ with lead sprue etc. 
> at valley forge. A simple specific gravity test will identify 
> them. dgo