Lead Free Bullet Casting Alloy Bismuth based

This was an intersting experiment with a steep learning curve.It was found that keeping the casting temperature was critical to maintain uniformity in bullet weight. It was difficult to get the bullets to drop from the mould. I believe this is due to the fact that bimuth expands upon cooling and wedges into the gease grooves. These bullets are hard and cast about 465gr. from a 535gr. mould. They sized well, 0.459 in for the 45-120. The bullets were loaded with 120gr of 2Fg and compared to the lead counterpart. Unlike the lead the bismuth bullets were diffult to chamber and had to be forced into the chamber (bismuth does not shrink like lead making the nose oversized).Test firing showed no difference in the accuracy of the bullets. A custom bullet mould with tapered as opposed to square grease grooves and smaller nose diameter to compensate for the lack of shrinkage should alleviate most of the formensioned problems.