I've been shooting the 150 grain ETips out of my .308 over a Varget the last few years. I haven't noticed them copper fouling much worse than cup and core bullets but I was interested when the new Copper Fouling Eliminator powder came out. Finally was able to give it a try yesterday. With Varget I've never been able to get close to published velocities. I start seeing pressure signs around 2750 fps and settled on a lighter charge at 2650. The starting load of CFE223 broke 2800 fps no problem! I worked my way up in half grain increments. I easily got 2850fps and started seeing no real increase past 2900fps and primers started flattening out. Looks like I can easily get a 200 fps increase over Varget with CFE223. No idea about the copper fouling claims but the increased velocity is enough to have me thinking this is going to be my go to powder. Can't make any claims on accuracy as I only shot 2 at each charge just looking for a velocity and pressure ceiling. Looking forward to trying some more. 2850 fps with a .469 BC and 95%+ weight retention out of a 150 grain bullet and the recoil of a .308, I know it's no screamer like the .338 super mags but for a lead free option in a do most anything light recoil gun I'm pretty excited.