I've only ever seen 223 hollow point varmin rounds. Not to say there aren't 308 or others available though. Generally, you want a rifle round to be a FMJ. It's a lot more stable at distance and able to cause hydraulic cavitation because it retains its velocity better. Next time you're over, I'll open up a ballistics manual and show you the numbers. It's staggering the differences in velocity from pistol to rifle rounds. A couple of extremes here...a certain 45 load may produce a round that travels at less than 1000FPS(feet per second.) my 204 ruger, which is a 223 necked down to 204, travels at over 4000fps! Smaller bullet, but much higher velocity! Much greater hydraulic damage at the same distances. Sure, the 45 will have a larger entry and exit hole, but the 204 makes jelly inside!
The difference between stupidity and ignorance. Ignorance is doing something wrong and not knowing better. Stupidity is knowing better, but doing it anyway. Don't be stupid!