I'm new to casting, and fortunate enough to have an X-Ray Fluorescents Microscope where I work. For those that aren't familiar with this, it's basically a machine you stick things in, and it will give you a graph with percentages of what they are made of. So I took one of my ingots I made out of a bucket of WW's, and it told me it was 97% lead and 3% tin. Is this a good mix for pistol bullets? I'll be making .45acp, .44mag, .40sw, .380acp, and possibly .45-70 rifle. Thanks in advance for any help!!