Regarding recoil, in identically stocked rifles, I prefer shooting the 340. Recoil is more of push....not as sharp when comparing 210s vs 180/165s in the 300. It clearly didn’t kill elk any deader....but after shooting dozens of elk, it clearly seems to rock them harder. I’ve never shot an elk with the 340 that wasn’t visibly rocked. I can’t say that about the various 300s. For what it’s worth, nearly all of my elk were shot at >300yds.