Your Lino is short on tin I would say, get some 50/50 solder from the plumbers suppliers 1 stick to 10kg works with my mix which is wheel weights for pistol bullets and a mix of wheel weights and pure lead for rifle,
best temperature is 675-750F and flux it quite a lot, it's the antimony in the lino that is the problem tin breaks the surface tension and lets the lead flow into the mould cavities, the best mix is when the tin and antimony
% is the same, for the calibre's you are using you don't need a hard lead, to much lino and you will get leading caused by the antimony, hope this helps Robert.
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