I bought some of these a while back because they appeared to be a good deal (around $7 per box of 20) for 185 grain SCHP. Published fps out of a 4 inch 45 acp is 1050fps. The only video I could find used modeling clay as a test medium and while they expanded well, I'm not familiar with how it correlates. I've always been impressed with a homogenous copper bullet's penetration with a lighter weight bullet and figured they might work well. I couldn't find a manufacturer on the box and information found seems to be supposition. I don't think these are made by Double Tap. My P220 likes them but I haven't shot them out of the G30 yet. Input?