Some years back I used a 22/250 for deer. My bullet was a 55 grain Nosler/combined technology. Always a pass thru with massive lung damage. Saturday I finally made myself use my ar-15 (14.5" barrel ) with same bullet. Shot a Doe behind the shoulder at 30 yards and watched it run into a thicket 70 yards away. No blood on the ground until it was in the thicket . Found 10 to 12 spots for about 30 yards then it stopped. Searched about 80 yards in every direction, no more blood. Suspected bullet "blew up" on contact. 6 hours later, another doe came by,same shot,same distance, as it ran off into another thicket, it did not act like it had been hit. This time no. Blood anywhere. I suspect that at that short range the bullet had not stabilized yet and hit the deer while it still had "yaw". This caused bullet disintergration. Oh well, live and learn. At least the deer will live for another day. The AR platform is good for a lot of things,but, I'll go back to using a more suitable caliber for deer.