More powerful than the Texan cf? I believe they said the Texan is up in the 750-760 fr lb. From what I read, the hatsan 45 is only 700 ft lb.
I've got several Texans, and have been shooting them for several years. They are also excellent hunting rifles, I've got them in .257, .308. .357. and .457 and these have become guns that I trust and rely on. Last year I took deer, hogs, javalina, turkey, aoudad, and feral goats with them. Having said this, my long barrel production Texan .457 (in out of box trim) goes to about 600 fps. They may have a custom shop gun that goes higher, but I haven't seen anything in their catalog. I believe a couple of the guns Eric Henderson has tweaked are doing that.
I certainly don't think power is the end all and be all of a good hunting rifle, you need the whole package.... and in this respect accuracy is more important once you reach a certain energy threshold. But I do believe the Piledriver is the highest power (out of box production rifle) out there..... and from what I saw in my short experience with it is that it ticks the other boxes as well.