PHs aren’t going to give you [bleep] ammo in a rental rifle. It just makes their follow up job tougher. I’ve used camp rifles on the last 10 safaris. No problems. I’ve taken croc, sable, kudu, gemsbok, wildebeest and lots of small stuff with a .30-06, all with no problems. Also no drama with multiple elephants, buffalo and hippo with larger calibers in camp rifles…. Use what you shoot best. A 30-06 is enough gun.