I spent several seasons with my first 280AI and 63gr of N165 and 140 Accubonds. Never had a whitetail run more than 75 yards however got tiny entrance and exit holes. Most were heart/lung placement. Most deer ran. Big internal destruction but almost no blood trails. The exception to this was a 275 yard shot doe. Much greater blood loss and exit hole. I have never fully understood the internal ballistics of the Nosler Accubond. Given that it is a bonded bullet, could I have still been getting core separation at high speed? Probably going close to 3000 fps at under 100 y ranges.
Only the back end of the AB is bonded; the front isn't. Might explain your smaller exit holes as the front of the bullet blows off under impact and the rear penetrates.
At longer ranges velocity is lower and the bullet holds more frontal area...bigger exit(?).
