The goldenloki tests seem to feature a lot of bullets that were in their prime 15-25 years ago. And the poor expansion exhibited by almost all of them proves that too. Thing is, like gofast said, a heavier bullet will lose less of it's velocity potential in a shorter barrel than a light and fast bullet, and they are designed for significantly lower velocities than the lighter, faster bullets.
The lighter bullets need to be able to hold themselves together at higher velocities than the 147s will ever see, which allows the 147 to be designed to respond much better to lower than expected velocities than the lightweights. 147s have higher inherent momentum and higher inherent penetration capability, so they don't need to sacrifice expansion to get the same minimum penetration depth as a lighter, similiarly designed bullet.
I'm talking purely apples to apples, if you have an older (or proven, if you like) bullet design that works well for you, go for it, but the 147s of today are the better bullets. I'm mostly talking about bullets of a like design in various weights.
Most of the Golden Loki tested stuff didn't look very impressive or even really all that up to par to me. Tested a bunch of 1992 vintage stuff, some of which you can't even find anymore outside of a couple of boxes of collector's interest stuff. It's cool that they did the tests, I appreciate the time and information, I just think it's not particularly helpful in 2011.