I have used the 243 in the past. I don't believe the BT to be a great deer bullet in the 243. I much prefer the 100 gr. Nosler Partition. It is available from Federal in its Premium line of ammo. The BT is good on broadside shots in the heart/lung area. I don't like it if you have to take a quartering shot or a head on shot. This is why I prefer the partition out of the 243.