Whole lot of lung shot talk. Why? Years ago I figured out if you shoot deer through the flat shoulder bone with lighter caliber rounds it drops them right there and really does little meat damage. I never intentionally shoot a deer through the lungs anymore, too many bad experiences tracking or someone else finishing it off. If I can't get a broadside shot on the shoulder a neck shot works. I went through the big bullet stage, 220gr 8mm, .358 Win.,7.62x54, .300 mag.....,what a waste of good meat. I was young and paid attention to "experts" around the campfire. I had problems with the occasional bullet not opening up on lung shots and that makes for a long tracking session. I don't think I would take anything heavier than a .300 Savage out anymore. If you don't trust your shooting ability, maybe some practice is in order.