Sorry--knew I'd brain-farted somewhere. I used my tin to make 20:1 ingots, and it was this that I combined 7-1 w/ the 18 BHN ingots to reach ( a theoretical) 11 BHN to approximate an 18:1 alloy for the long bore riding bullets. Neither do I have a hardness tester. Sorry for the confusion, but I doubt it changes anything. Thanks everyone.