I used these last year in the .270 140 grain - was very favorably impressed. At 3250 fps muzzle velocity, the bullet hit an elk broadside at 275 yards - went in just behind the shoulder and came out through the off shoulder. Elk staggered about 35 yards and went down. The shape of the "wound channel" was similar to the partition - made a fairly big hole through the ribs and then settled into a smaller hole through the lungs - but the end result was very satisfactory.

P.S.: Bullet was not recovered.