I just finished my first batch of cast bullets, and I'd love some thoughts on what I could do to improve. I'm loading for a Pedersoli Sharps in .45/70. The alloy I mixed was 20/1 lead to lead-free solder (95/5 tin and antimony) - I basically mixed 20lb of scuba weights and roofing flashing with 1 lb of the solder in 5 lbs increments. I used a Lyman Big Dipper casting furnace with the 10 pound pot.
The mold is a Lee 459-500-3R. I know it's probably not ideal but I picked it up a year ago when I had an Amazon gift card. I figure I can at least try it out before moving up to a Lyman Postell or something. I kept the alloy temp about 675 to 700 degrees.
Such much for background. I cast about 100 bullets that were good enough to keep and probably did another 100 or so that were rejects while I tried to get the hang of the technique and find a temp that wouldn't leave wrinkles.
Here's my biggest question: 2/3 of the bullets dropped st an average of 475gn, another almost 1/3 were about 478 average, and a small handful were over 480gn. I sorted them by 3-grain spreads. One single bullet came put at 500gn, and the next heaviest were 5 bullets that were 484 to 486.
Most of the bullets dropped frosty, rather than shiny, no matter the temp, but I don't know how much that affects things. I did degrease and smoke the mold prior to use.
So, why might i have light bullets, and what should I do different next time if these don't shoot well?
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