I have been dabbling on testing an alloy strength with pencils. Now i just picked a Lee tester which I'm sure will provide me with hours of fun refining my ability to measure and testing different theories. As I was greeting into setting my samples I was wondering; how homogeneous is a homemade alloy? Say we grab some wheel weighs, measure some shotgun shot for added antimony, add some tin for better flow and to combat brittleness, flux and mix here and there; at the end of the day how even is the alloy from first ingot/bullet to the last one cast an hour later? Would the different metals have a tendency while on the pot to float out of solution into a separate layer? How about when they cool on the ingot? I know you shouldn't test the top but how much precipitation happens that renders the bottom significantly different than the middle, or sides, or top?