Haven't been bowhunting long, have you, nopardaid?

10 grains per pound was considered pretty much standard until people started hunting with their IBO target rigs. Now, it's been going on so long thateverybody thinks 5-6 grains per pound is what you're supposed to do. You can get by with it, as long as you're putting out a lot of KE, but KEalone is not the reason.

A 350 gn arrow traveling at 300 fps, with 70 ft lbs of KE,will penetrate like a 700 gn arrow at 150 fps and only 35 ft lbs. The reason is both arrows have equal momentum. The lower you go on KE, the higher you need to go on arrow weight. It increases the momentum to make up for the lower KE. Ramp up that 700 gn arrow to 70 ft lbs @ 212 fps, and the momentum goes so high there hasn't been a deer made that's tough enough to stop it. Even a moose would beput hard to it to stop that arrow.

Itruly believeshooting a 5-6 grains per pound arrow with low KE - like under 50 ftlbs -won't RELIABLY get the job done for hunting, especially if bone is hit. Has someone done it with that kind of setup? I'm sure they have. I'm sure somebody, somewhere has even gotten a complete passthru with such a setup. Some people try to ride a skateboard down a handrail too, but watched the videos of themthem wrecking out. Looks like it hurts, so I know it's something I don't want to do.

Likewise, I've watched video of people shooting light carbon arrows and, more often than not, they do not get a complete passthru. One deer hunting video I've seen has 10 different bow kills. Only one guy out of the bunchgot a passthru and he was the one shooting aluminum. With cut on contact heads too (looked like Magnus II).

I've also seen some so-called 'penetration tests' like you describe, usually published by folks that make money from selling carbon arrows. Often the heavier arrow is a fat aluminum arrow and the light one is a skinny carbon, shooting into high density foam. The aluminum has a lot more surface area, and the target stops it easier. More surface area means more friction, and foam targets stop arrows by friction. I believe that the heavier arrow would beat the snot out of the light one if both were set up with identical broadheads and shot into ballistic gelatin, but I've not seen or heard of anyone doing that test.

In other words, they stack the deck to makethe performance of their products look a lot better than it actually is, in comparison to the competition. Standard marketing practice. It's very transparent when you think it through, but most people don't do that. They're easily impressed, so they buy the scam and the product. Like I said,bowhunters can get away with it if they're shooting enough bow but, people who don't, theywind up having problems.

One reason I recommended the CX Terminators is they have the small diameter like ICS carbons, but have the weight of aluminum. IMO, that's the best of both worlds. Lower surface area with more momentum, and a couple of ft lbs more KE from the bow. And the arrow with higher momentum carries it's KE further downrange than light ones do, and it's how much KE the arrow arrives with at the animal that really matters.