I have a lee 45 colt 300 gr 2 cav (c452-300) g/c Lee mould that casts .451, .4515,.452, so I sent them back to lee. Lee blamed it on pins not lubed enough and not smoaked enough. They also sent a cast boolit suposedly cast with my mould that had been run through the lee sizer die which is the same die I use. the boolit was a perfect .452. I dont know what alloy they used BUT the boolit is so hard it cant be marked at all with a finger nail, it also only weighs 277 gn with g/c installed my boolits weigh 315 gn /w g/c installed, my alloy is 50/50 pb/ww. I still cant get the mould to cast up to be sized down correctly. I ran the sample through the sizer and it stayed .452 so the sizer isnt under size. Looking for some help.