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General >> Ammunition, reloading, shooting, etc >> Two Things I Learned Yesterday

Message started by Hamish on Jul 25th, 2018 at 4:48pm

Title: Re: Two Things I Learned Yesterday
Post by badgeredd on Jul 31st, 2018 at 8:40pm
Thank you Hamish for the link to this sight. A big Howdy to all of you and a Hello to Madsenshooter.

Madsenshooter and I discussed the copper enhancement of bullet alloy several years ago on another forum. I really don't know what his alloy is or which babbitt type he uses. I have primarily used the type 2 babbitt because I have quite a bit of scrap that my Dad collected while working on the railroad. I have used type 1, 3, and 11. My experimenting has convinced me that 1/4% copper in a balanced alloy gives me the best results. More copper gives little improvement GENERALLY. That said, anyone that has gotten really good results with more, I'd like to hear from you.

It is an imperfect way to alloy the way I do because I make some assumptions. One of said assumptions is that clip-on-wheel weight lead contains about 3 1/4% antimony. For many my way will work well. I use an alloy calculator to arrive at my alloys. I have found that if one "balances" the alloy, few if any problems occur. By balanced I mean the tin content equals (or nearly so) the sum of the copper content and the antimony content. MY best results have been with an alloy of about 2 1/2 % antimony, about 0.15 to 0.2% copper and about 2.7x% tin. I would caution that a significantly higher tin content that the sum of the antimony and copper will cause problems with bullets stabilizing at their hardness and size for quite a long time (in one case,over 6 months and the alloy was still unstable); while keeping the elements in the proportion I gave will allow rather good stability after 2 week after being cast. I water drop or heat treat my casting to achieve maximum hardness for high pressure loads but your experience may differ.
If anyone would like more information on my experiences with copper enhanced alloys, please ask. Thanks for reading my short (?) summation of my experience with copper in bullet alloy.


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