So I have a .22-250 model 12 fv savage that we were trying to come up with a load for to go p-dog hunting. After trying 4 different kinds of brass, 6 different bullets, 2 different primers, and having all of them blow out and flatten primers I concluded that something was wrong with the gun. Took it to a custom rifle
maker/gun smith, he checked it with go/no go gauge and said the head space was too long. However he did not have the savage barrel nut wrench, so he could not complete the job by fixing it. So I took the gun to another gunsmith who assured me that the headspace might be correct and that there could be other overlooked problems that were causing the blowing out and flatning of primers. Went to pick the gun up today and he said that he used a bore scope and found an excessive amount of copper in the rifleing so he cleaned it very thouroughly. I could see where excesive copper would create extra pressure. But what I don't understand is where it came from. When I clean the barrel, I do a very thorough job, and I use sweets which is known to be a very strong solvent. The cleaning method that I prescribe to consists as follows...
1. Hoppes no 9 powder solvent on wire brush, 30 strokes(to break up powder and carbon residue that lies on top of copper)
2. Dry patches until they appear as clean as they were when I put them in.
3. Hoppes no 9 powder solvent on wire brush, 30 strokes, this time I let it soak for 30 minutes.
4. Repeat step 2
5. Hold gun up stock down barrel pointing straight up. Use old pistol cleaning rod with big cotton swab on end to jam into back end of barrel through reciever. Next poor sweets down inside of barrel and let soak for 30 minutes.
6. Repeat step 2.
7. Repeat step 3.
8. Repeat step 2.
9. Repeat step 5.
10. Repeat step 2.
11. Keep doing this until copper is no longer visible.
I last cleaned the barrel probably 100 shots before he saw it, is it possible that the gun built up that much copper in 100 shots? I have never heard of this...