New boy here again, now I need some advice on casting if anyone can help me. I bought the Lee kit for casting .577 bullets and followed the instructions to the letter, smoked the die, etc, but I am having some poor results. (I have the Lee book and have read it)

The problem seems to be that the metal doesn't flow exactly where it should and I end up with "flow lines" and sometimes small air pockets. ( I have pics but no idea how to post them)

Am I running the metal too hot? too cold? or is it likely to be mould temp or what? Appreciate it's difficult to advise when you can't see the results, I would be grateful for any help, even if the advice is only that I bought the wrong kit!