Re: Limits of the .260 rem for long range, big game?
The problem of asking this question is it always turns into a shit storm of guys saying you can kill elk with a 22LR arguing with guys saying you need a 470 nitro for elk and everything in between.
I'm sure with perfect shot placement you can kill an elk easily with a lot of calibers even smaller than the 260 at 400 yards. 1000 ft/lbs is common recommendation for deer, for elk I usually see 1500 ft/lbs listed as a good minimum. One has to remember a big bull elk can be 4x the weight of a big mule deer, hide, shoulder and rib bones are all significantly thicker as well. Using that stat the 260 rem appears to be under 1500 ft/lbs by around 250 yards. By comparison even a 180gr nosler partition in a .308 is around 1500 ft/lbs at 400 yards. Most don't consider the .308 ideal for elk either and it has significantly more hitting power than the .260 does.
That said, I have no doubt a 140gr round with 1000 ft/lbs at 400 yards will get the job done when placed exactly where it needs to be and I certainly would not call it unethical, but it wouldn't be in my top 10 caliber choices for elk hunting either and I wouldn't want to try and put one through both shoulders.
Most likely past 400 yards the biggest limitation is the guy pulling the trigger to ensure it is a perfect shot. So you really need to sit down with yourself and consider if you can make a perfect shot reliably in field conditions at 400+ yards, many think they can, many can on the range in a controlled setting all day, but in true field conditions out hunting it's much harder. If you're confident in all situations, variable wind, your HR pounding, up and downhill shots, tired from a days hike (and days of hiking before it), in the cold and wind, with less than ideal shooting positions and a less than solid rest, you can 100% of the time hit a 8" circle at 400-500 yards then it should be fine.