Just got my 123gr SP. I was excited, but after 40-50 rounds of firing (not radid fire), the barrel got SOOOO hot, you couldn't touch it. I don't think this happened with the HP ammo. And yes, it is marked 123 gr, not 154 gr. It kicks more also - do I have a "bad/hot batch"?
I was test firing my new Yugo M70 CAI.