My HK shoots the 147 grain bullets to point of aim at 25 meters. But, my prefered round it the Winchestar Ranger 127 +P+. I have developed a great reload that shoots to the same point of aim but allows me to use a less powerful round to keep from beathing the gun to death. (I shoot a lot).
I went on the HK Forum and it was like I was a complete blasphemer for taking an HK part off. I love the gun but I like to have a weapon that will shoot whatever cartridge I load or buy.