Perfect for deer. The 90 grain Accubond with has worked well for us.
This may be a controversial opinion, but I've always thought of specific range limitations as nonsense. A person who says "my limit on big game is 300 yards" can't tell me they wouldn't take a shot at 301 yards on the deer of a lifetime if the conditions were right. So, how much farther then?With that in mind, sure, the 240 is probably light at extreme range. We can define extreme range based on our own confidence and ability. The range limit is the point you aren't confident. Yes, some people are over confident and that leads to trouble. Ok, I'm not being very helpful.
The farthest shot on a deer taken with one of my 240s was by my son; 423 yards. Two steps and flop. I would shoot at that distance and farther with either of my 240s without hesitation under good conditions.
If you buy a 240, enjoy. It's a terrific cartridge.