I didn't much care for it in a bolt when I first tried it, but the AR's love it.
Copper Fouling Eraser, more like carbon fouling eraser. Doesn't seem to do much for copper for me, but damn, it's really good at stopping carbon buildup.
It does seem to have the magical ability to get the most FPS per inch of any powder I've played with.
It's a ball powder, it shouldn't be temp stable. Someone here has claimed they it's very temp stable, but I'm not sure, I was not able to get that consistent results with it when making accurate loads. I stick to Benchmark or other powders when I'm going to accuracy.
I love it for making FMJ rounds in my AR's. It's very slow burning and gassy, makes sure my 20" DI and 11.5" Piston cycle well. Also feels smoother then some faster burning powders for the application. It's totally too slow for the application if it wasn't for the semi-auto factor.
It seems to be BL-C(2) with a dry lube mixed into it. When you clean your gun after using it, your patches come out blacker then you've even seen them and you first think it's the dirtiest powder you've ever used, and are appalled and offended, but then you notice the patches turn grey to which way faster then any other powder. It because all that black was the dry lube you just wiped out, and in fact, it stopped the normal carbon fouling to build up.
Cleaning an AR bolt is a breeze. Instead of having to muck out carbon, you are simply wiping off dry lube. If you run a piston gun, it keeps that piston running smoothly, and again, when you go to clean it, you are wiping out dry lube. Everything seems to clean up much faster, tho it seems much dirtier at first.
In fact, I noticed something weird about it. Cause it's so gassy and gets into everything, and cause it stops carbon from building up, I've actually noticed it clean carbon off an AR bolt.
I had an AR bolt with a small amount of carbon buildup that I did not bother scraping off, then I ran the gun with CFE, and when I cleaned it the next time, the carbon was gone.
The dry lube stopped the carbon from sticking to the bolt, and actually allowed the existing left over carbon to burn off, cleaning the bolt. It was quite a finding.
Anyway, it's an interesting powder. I find it too gassy from some applications, I can't stand it in a 16" carbine AR.