I finally broke down and tried it as it is almost $7 per 50box cheaper than Rem UMC or WWB in .45acp. I have been shooting .22LR almost exclusively because of the cost of centerfire ammo (plus my sp101 .22 is just so darn fun) but I was neglecting practice with my SD guns. It cycled the weapon with 100% reliability, so no complaint there at all. My P220 has been able to function any ammo I have tried. It has been extremely reliable. However, the amount of crud in the barrel, chamber, breech face, and extractor is unbelievable! I am actually quite impressed that the gun still functioned while that fouled up inside. And YES it is a USA made Sig. Usually I run a wet patch soaked in Hoppe's no9 and let it sit while I clean the rest of the gun, maybe 20mins. A couple more wet patches followed by a few dry patches and I am done. Today I had to soak the barrel for 20mins, scrub barrel with phosphor bronze brush, soak again, scrub with brush again, and repeat the process about 5 more times to get the junk out of the barrel. I was just surprised to be honest. I had NO DOUBT that the steel case ammo was safe to shoot in my Sig P220. I was not worried about it at all. I would reckon a guess that 70%+ of the world's armies use steel cased ammo. I am not starting this thread to argue the pros/cons of steel ammo. I am comfortable shooting it in even my expensive guns like my P220. I am curious as to why this ammo is just so darn filthy. Any ammo experts know what it is that causes the extra stubborn fouling? I will buy it again, but next time I will just soak the barrel in a bowl of Hoppes for about an hour before I start cleaning it.