Good expansion with high weight retention are what I look for in a jacketed hunting bullet. No lead core bullet, whether bonded or not, will retain 100% of its original in all situations. When bone is encountered, exposed lead gets wiped away. I can accept that.
I can also accept that deer are not that hard to kill and almost any bullet will work on a broadside. What I am more concerned about, however, is when things go wrong. Will a bullet that falls apart on a broadside be able to make it to the vitals if the angle is bad? I choose to minimize the possibility that it might not by choosing bullets that are more solidly constructed.
Nor am I alone in doing so - few would intentionally choose a varmint bullet for deer when an identical bullet designed for deer was available. For decades many people have chosen Nolser Partitions because they have a mechanism designed to limit weight loss. Bonded and monometal bullets provide the same advantages to a greater or lesser degree and are quite popular.
A couple of weeks ago while elk and deer hunting I had an opportunity to appreciate my choice of bullets - in this case a 7mm 140g bonded North Fork launched at 3200fps. A buck mule deer provided me with a fleeting shot opportunity which I took. The buck was standing still, quartering away, and I placed the crosshairs so the bullet would enter just behind the ribs. Just as the trigger broke, though, the buck decided it had had enough and stepped forward. Instead of entering behind the ribs the bullet entered the right ham.The buck dropped in its tracks and while gutting it we recovered the bullet from the lung cavity. That was 3 feet of penetration. The bullet retained 131.2g or the original 140g.
Here's a few pictures of recovered North Fork bullets. From left-to-right:
.30-06, 165 grain @ 2800fps, recovered from dirt
(500 yards, 145.0 grains retained weight, 90.9%)
.30-06, 165 grain @ 2800fps, recovered from cow elk
(~25 yards, 133.2 grains retained weight, 80.7%)
7mm 140 grain @ 3200fps, recovered from buck mule deer
(~150 yards, 131.2 grains retained weight, 93.7%)
Here's links to full-size pictures:
Top Side Bottom