Mack Bolan was one of the things that sparked my interest in the .44 Auto Mag. But after the first hundred or so books it was just lame.
Early on I knew the writer didn't know jack about shooting, even if he did get the names, models and calbers right most of the time. A 1000 yd shot, from the deck of a cabin cruiser on lake Michigan, taking the golf ball off the tee as the Mafia don bagins his backswing....riding the recoil of the .460 Weatherby, never losing sight of his target in the 20x scope.....the Sarge might have been the best sniper in Nam, but you kind of have to suspend reality to believe that one....
Never cared much for King. Passable writer, but short on new ideas. Good telling of old stories, but not much genuinely new. Personally, he appears to be another NE elitist. Just one with a bit of talent for storytelling.
All else being equal (and it almost never is) bigger bullets tend to work better.