The one time I tried the IB in a 270 win, they would not shoot;have not tried them since although it looks like they do a pretty good job with good expansion and frontal area.I have not gotten around to trying them in other calibers.
I've killed only one buck with the AB;he was the biggest-bodied mule deer I've ever shot,a monster type in Alberta.He was shot at about 175 yards through the onside shoulder,quartering on with a 140 AB from a 7 Mag at 3250 MV. Bullet broke the onside shoulder,went through the chest,and was found against the offside ribs.It weighs about 60 grains,and I saw nothing remarkable about its' performance as I've gotten cup-core bullets to do as well. Based solely on this(a small sampling for sure)I could not call them any better than a slightly tougher BT.Apparently the heavier ones penetrate better and hold more weight as some on here have good success with them on elk size stuff.They are very accurate,though and seem to do a passable job on deer.
What advantage they hold over a Partition sort of escapes me though.
