I had some time on my hands and thought I would test 140gr Nosler Partition and 129gr Hornady Interbond bullets by shooting them into a wet pack that I made with some old telephone directories. On all these pictures the NP is on top and the IB at the bottom. On the first picture, which is also the first book you can see the IB opened much quicker than the NP. In picture 2 which is book number 3 you can see the NP is now just as big as the IB. In the 3
rd picture which is book number 5 the NP is in its trademark mushroom while the IB still made a bigger whole. The IB ended on 82% of its original weight and the NP made 76%. The IB paid for the bigger mushroom by penetrating 32cm while the NP penetrated 42cm.
The NP was @ 2760fps and the IB was @ 2910fps.