I used them, in the late 80s or early 90s, 150 grainers in a .300 Savage at about 2550 fps. They didn't open up much, probably because the old .300 just didn't have enough velocity for them. I bought them cheap from a fellow who went to gunshows and bought stuff and resold it. I quit them for deer and went back to Speer Hot Cores or Hornaday Spire points (shot a lot of pre-interlock spire points out of that old .300). The bronze points made dandy practice bullets and shot very well.