I have switched to Ace 145 and Wensel Woodsmans 150, both screw ins. I had been using Magnus 100 gr. vented, no problems really, good flight, 4 deer with 4 hits. I occasionally got some wind plane on windy days. The heavier heads shoot great out to 25 yds, which is about my limit.The main reason is that in tuning my bows, all shot much quieter, much better, less finicky with theser heavier heads. In looking at penetration, A deer got run over by my house this spring, called F&W, asked them if I could move out of my yard, knew the officer, he said sure. I took my 4 wheeler and trailer took to the back forty and propped dead deer up. Then proceded to test different broadheads for penetration using a clicker and a release from my wheel bow days. The 145-150 versus the 100gr, same arrows, 15 yds, on shoulders and hams. Heavier heads penetrated about 4-5 inches more, all I needed to see.