Do some calibers or brands of ammo leave more copper residue than others? I was cleaning my rifles the other day and found that there was a significant amount of copper residue in the 270 which I use only 140Gr Hornady SST. The 308 had next to no copper residue coming out of it and I use Federal blue box 150gr in it. Both rifles had no more than 20-30 rounds through them since last cleaning, which was 2 years ago. I used Pro Shot copper solvent for the initial scrub out and then Wipe Out for two applications with a minimal of 1 hour soak times each time. At no point had a brush been used up to this point. The patches were coming out very blue on single passes in the 270 but hardly any with the 308.....
different factory ammo and copper residue
- Thread starter Joe549
- Start date
I do find Hornady bullets to leave significantly more copper fouling in the bores than any other brand. I've read that it's because they use a softer copper alloy for their jackets but I've never looked into it too much. I don't use much factory ammo but they use the same bullets in their factory loads that they sell as components so it makes sense that both could cause this.
