Re: Get the copper out!
I have had good luck with the 50 BMG but it is difficult to find where I live and found it quite expensive.
If any of you have ever smelled 50 BMG, you will note the obvious STRONG ammonia odor. Of all of the copper solvents that I have used, the stronger the ammonia odor, the better they work. This put me to work looking for sources of ammonia to make my own solvent.
First off, the stuff in the grocery store is only about 2-3% ammonia and is too dilute to be of any use. After a little online searching, I found a source for 28% ammonia from a chemical supply wharehouse. 10 fluid ounces of water, 1 ounce of hand dishwashing detergent as a surfactant, and 8 ounces of 28% ammonia clean better than anything I have found for sale. Another great thing is that one gallon of the ammonia cost me about 40 bucks with shipping. Needless to say, that will make a hell of a lot of copper solvent.
Just a note of caution, in high concentrations, ammonia is hygroscopic and can attract water from the air so dont leave it in the bore over night.