The Omega line from T/C has a 1:28" rate of twist. That's pretty fast, so you want to look for just about the longest bullet you can find. I've used the T/C Maxi-Balls, Barnes Bullets, and Powerbelts and they all work well in my rifle with a 1:32" twist (and all of them are legal for hunting in Colorado).
Here is the scenario... you sit in your 2 piece climbing stand and your foot inadvertently bumps the lower section while there is no weight on it - and it slides down the tree, out of reach!
OK, you are safe - you have a string tied from the upper section that you are sitting on and the foot portion that slid 4-5 feet down the tree. All you have to do it pull the other section up, reposition it and you are back in business, correct?
Have you ever tested this theory?
I have -...