For about a year or so I been developing a new alloy that reacts like a lead and tin mix but casts a very light bullet but still holds together to take down the silhouette. I'm getting very close to what I'm looking for.
The photo above are two bullets cast with the same mould and both are filled out completely but one weighs 475.5 gr and the other weighs 373.1 gr that makes 102.4 difference in weight cast with the same mould.
I haven't tested or recovered enough to say, that's what I'm looking for

Kurt