I used them in a Howa 1500 Varmit rifle with a heavy barrel. Got a good price on 50 of them. Took them out to Bonita Canyon in the Zuni Mountains in New Mexico. I got on paper at 100 yards and decided to see how the cartridge would group. It patterned pretty well, but was lousy at grouping. I swear it was a six inch five shot group at best. I ended up just shooting them to hear the bang because they were not accurate enough in the rifle to do anything else. That is the only experience I have had with them. In fact, in the past 12 years that is the only factory loaded cartridge I have fired in any rifle I owned. Tom P