Welcome To Cast Boolits ... You are off to a good start !
I also test every wheel weight , the clip on wheel weights you can cast into ingots and mark them as such ... COWW stamped into each beats a slip of paper in the bucket ... the paper disappears and you forget !
A good alloy , which stretches your supply of COWW is to mix it 50-50 with soft lead ... it doesn't need to be pure lead just soft like range scrap or possibly lead fishing sinkers or anything that is mostly soft lead .
My free unlimited source of wheel weights retired from the tire business and I had to find a way to stretch my COWW supply ... the boys in the hunting section used 50-50 COWW -Soft Lead in 30-30 deer loads and they mushroomed nicely so I tried the mix ... it makes a better boolit , handgun and most rifle , than straight COWW.
Keep your COWW and soft lead ingots marked when casting I put one of each in the pot ...
the mix doesn't have to be a perfectly exact 50-50 blend , close works just fine and dandy !
I have that same Lee 170 gr. F mould and a Winchester model 94 , 30-30 ... have done a lot of shooting with it at targets and load development ... haven't made a deer or hog hunt ...yet !
Gary