Decent article. The British Sten loads killed a lot of pistol actions over the years. The mE is actually relatively safe to shoot, but the higher velocity and the steel core may produce unwanted results at the range. The major problem in the P08 was the tendency for steel cased ammunition to get stuck, because of the step in the chamber. Mauser developed a reamer during WW2 that allowed a field armorer to remove the step, thus making the P08 able to shoot steel cased ammunition without possible jams.
The worst ammunition isn't mentioned in the article, the SE bullet (Sintereisen / sintered iron). This bullet wears out the barrel quicker than you want, producing nice sparks in the process.
Another drawback of surplus WW2 steel cased ammunition is the possible corrosion of the steel case on the inside, caused by the deterioration of the powder. Several US collectors have reported 9mm rounds that had been virtually eaten away from the inside.
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