338 RCM or 358/6.5 PRC October 08, 2021, 09:12:14 AM So. I'm getting a hankering for another carbine. But this one needs to have some Thump to it. I want a 338 - 375 cal bullet , at least 225 gr going at least 2650 fps. From a 16.5 " barrel. Built on a stainless Ruger M77 Mk2 or Hawkeye action.