Just bought a Ruger Mark IV Hunter. Want to be sure I use ammo that is correct for the pistol. PLEASE RECOMMEND ammo that is the "right" for the Mark IV. Should I stay sub-sonic? Do I go Hyper-sonic? Does it matter? Virtually all my shooting will be at paper targets and no more than 50 yards; mostly at 25. I am trying to be careful that I do not use ammo that produces an overly aggressive slamming of the bolt rearward and forward. Feel free to recommend Brand and Velocity and what ammo to NOT use. ANY AND ALL comments from the TFF community will be appreciated. THANK YOU.