Out of the five pigs I've knocked over thus far, they all went down to one arrow. The first was a pass-through with a 877 grain Grizzlystik, the second was a drop-on-the-spot spine-shot, again with the Grizzlystik. For the third, I'd switched to the lighter 704 grain CX arrows, and that was a pass-through. The fourth would've been a pass-through, but the angle of the shot caused it to bury into the sand on the other side of the sleeping pig - still complete penetration. Last week, on the smallest pig I've yet shot (only about 25 to 30kgs), the arrow buried up to the fletching, but pulled through the far-side as she did her dash. I'm new to carbon arrows too, and I chose the CX over the GT because of a small increase in weight. I like them alot, and hope to put them to good use.