OK is copper of about 1% worth it? Does it really make a tougher bullet? And can you shoot them faster than say #2 alloy?
I use a ladle too with an RCBS pot on a hot plate. 650 is a full pot and 675 is less than half. Can break out the Coleman stove that likes to get up to 750 on the lowest setting then switch to the hot plate seams my molds love the lower temps.Run it closer to 725 and it will be about right. Listen to the pot. It the spout is plugging or freezing then increase the heat. No exact science, just observe what is happening and adjust accordingly. The 725 temp is where I ran mine but I used a ladle.
It is to me, it does make the bullet tougher and you can shoot it faster and it will go down range in one piece rather than drift off in a cloud of gray looking smoke. I initially had problems in .30 and 6mm comming apart at higher speeds. Since I started using copper addition I have not even had that issue even one time and I have driven both to point that cases started showing signs of OP and bolts were hard to operate ( way above what I should have). Easy way to test is get a pound of the copper babbit from roto metals. Nice and clean and known amount so no question on tests.OK is copper of about 1% worth it? Does it really make a tougher bullet? And can you shoot them faster than say #2 alloy?
Like Eutectic wrote, these alloys are unique. The metals sort of dissolve in each other, rather than melt per se. Solid copper dissolves in molten tin and the resulting alloy still has a low melt point. The tin/copper can be dissolved in bullet alloy. Of course there are saturation limits which are dependent on temperature (same as salt and water), but depending on percentages of each of four or five metals together in the pot, interesting things happen as the alloy begins to cool and different phases of crystallization occur. The dendrite lattice structure is what adds strength to the basic lead alloy.Out of curiosity I googled "copper melting temp." and got 1,984 degrees Fahrenheit. How do you alloy that with a lower lead temperature? Or does it just stay suspended in the lead? I've read lead vaporizes at about 1,000 degrees and I don't plant to heat my alloys that high...