Totally agree with Dodgy and for the record I am not totally opposed to long range hunting. In fact I have a couple of rifles set up for greater distance hunting myself. However what I realised when I got out shooting longer ranges is how fickle and unpredictable the wind can be. Even with wind flags every hundred metres or so the wind call on the first shot is nothing more than a guess. Once you have actual point of impact data then the second and third shots become more measured and predictable. As an example I recently shot at the excellent Eskdalemuir 2k range run by Gardners Guns and engaged a target at about 600m, at the firing point the wind was left to right and the 500m wind flag was showing right to left but the 700 m flag back to left to right. With wind direction changing so much, There is no way of guaranteeing a hit on a 1moa target at this range with the first shot which is what long range hunting is about. A lot of the change in wind direction in the above situation is down to the ground contour and cross valley shots may well be easier due to more uniform air currents but the point is that it is impossible to say what will happen with certainty.The most important thing for you to do here @Ackers-303, is to understand that you must filter out all the responses from guys that never have, and never will, shoot deer at 500-600m. You need advice specifically from blokes that do shoot like this regularly and have done for a good while. The forum is replete with armchair experts not qualified by experience, but by opinion formed entirely subjectively.
The 6.5 PRC is superior to the .270 Win for distance hunting in one critically important way - it was specifically designed for it, using hundreds of years of combined experience of clever Hornady engineers. The numbers alone do not make the distinction as clear you might think - at 500m, the .270 Win doesn’t lag that far behind assuming you are using a bullet like the 145gr ELD-X in Hornady Precision Hunter, and you don’t have a short barrel.
Where the 6.5 PRC has a significant advantage is internal ballistics. Very clever people know what happens inside a cartridge at the moment of ignition, but suffice to say cartridge design has come a long, long way since 1925. So the 6.5 PRC has all the precision and accuracy gains developed over the course of the last couple of decades, as benchrest design philosophies like 30° shoulder angles have made their way into broader use, and in particular hunting rounds. As it takes off, which it will, more 6.5 hunting bullets will hit the market and more factory ammunition offerings will have ballistically superior bullets. The 6.5 PRC twist of 1:8” is much more useable and flexible, whereas the 1:10” twist .270 Win is maxxed out with the 145gr ELD-X and can’t accurately shoot anything longer.
The only reason you would select a .270 Win over a 6.5 PRC is ammunition availability, which almost certainly won’t be the problem some will claim as it is usually solved with a relatively easy internet search.
Regarding shooting deer at distance. You’ll get a lot of naysayers on here, simply though lack of experience, the culture, tradition and so on. You would be better off using one of the specialist long range forums or a forum in a country like New Zealand where a 500m deer with a 6.5 doesn’t bat an eyelid. What @srvet is getting at though is 100% valid, its not something you start doing after having only done close range stalking. You need a lot of practice and the best way to do that is to shoot gongs at varying ranges in varying conditions, on a property where you have proper natural terrain, shooting prone. Use flags along the line of sight to learn the wind, be prepared to get frustrated, make sure that you don’t start getting stingy on the amount you are shooting because the ammo is expensive. Believe me, shooting off the bench at Bisley won’t cut it, you need to shoot in the field.
Build up your confidence with experience, if you are a natural shot then it won’t be too long before you are pinging the 1 MOA gong at 600m.
All I’m saying is it’s easy to become Billy big balls with a flat shooting rifle and a diallable scope whose ego exceeds his ability. Get lots and lots of practice shooting gongs out to silly ranges and be honest about your first round hit probability before shooting live quarry at distance.
