The hunting community has generally converged around bolt rifles or double rifles in a relatively narrow power range, taking buffalo on foot, from about 50 yards. If someone suggests using a 375RUM because of its flat trajectory, it will be quickly pointed out that dangerous game "should" be taken at close range.
I have read this thread with interest. One item that comes to mind is this: Why is it rote that DG "should" be taken at close range? Several thoughts come to mind that may in part be the answer.
1) The big, slow cartridges that are most commonly in use on DG are not that accurate at ranges in excess of 50-100y when fired from iron sight rifles. A good 1st shot being paramount the PH guides the hunter in close.
2) The soft expanding bullets often used such as A-Frame or Barnes TSX will expand better at closer range due to faster velocity on impact.
3) The PH wants the hunter to get his/her money's worth and thus guides them in close to the buff/ele/other DG for the thrill.
4) Hunters have been castigated in Africa for wanting to shoot the animal from longer distances and thus get labeled as "Sniper" as was commented on this thread.
Being a long range shooter, I place a high degree of value on the ability to shoot and hit my tgt at ranges that many marksmen would claim is impossible. However, when hunting I rarely take a long shot for a variety of reasons. Some of my best hunting memories are from up close encounters. But, no matter how good I may place my first shot, the animal is going to be unpredictable. Some may charge even with the heart and both lungs shot to pieces. They are more likely to run away than at you but it can and does happen. In one bad experience I was surprised by a quarry which appeared unexpectedly forcing me to take an off-hand shot at a longer distance than I would have wanted. My shot was high/left on an animal which presented a frontal shot. The bullet choice was also poor. I was using a 270 ballistic tip in 130g and it fragmented doing some horrific damage to the upper shoulder and punctured one lung. I was using a CRF Mauser custom and as the wounded beast ran toward me I attempted three more followup shots as it approached and only hit with one of them which broke the front leg but did not drop the animal. My quarry ran past me at close range as I fired and missed the last shot. Being empty, I reloaded one into the mag and launched a final 5th shot downrange at the disappearing arse of my tgt. A very long tracking job thru thick brush was a lesson in the intelligence and toughness of some wild animals. After a few hours of tracking we found it dead about 600y away after dark. My personal performance was poor in this case. A variety of lessons were learned:
1) Frontal shots are more likely to fail since they cannot usually puncture both lungs and the heart with one shot. Avoids these if possible.
2) I failed to check zero on this hunt and the scope I was using was off causing me to hit high by several inches. This is the first and only time I did not check zero before hunting and I paid for it with a poorly placed 1st shot and a bunch of missed followups.
3) I need more practice on taking off hand shots under pressure.
4) With exception of varmint hunting the ballistic tip bullets are not the best choice for hunting larger game. They work OK on broadside shots but fragment and can fail to penetrate enough on other frontal or quartering shots. A better bonded soft point or Barnes type bullet is now my choice most times.
5) Lighter bullets are not usually the best choice for larger game. It took me a while to learn this.
Many years ago I went on my first DG hunt. It was in an undisclosed location. I shot my quarry with a perfect broadside shot with a 7.62x51mm (308) at very close range. It was an iron sight shot with an FAL from about 5ft range. The quarry did not flinch and I was stunned that such a close range and obviously well placed shot had no visible affect on my quarry. I could have (should have) fired two or three more times but was so surprised that I just watched as he ran away. He ran about 30y and died. Stone dead. He was dead after the shot but it took a few seconds for him to realize it. Lesson learned. If the quarry is still up and moving, keep shooting until it is not.
I am not a double gun hater. I do not own a DR due to the princely sum required to acquire one and my limited opportunity to use it. I do own a nice SxS shotgun and use it often. It is light, handy, accurate and for some situations it is great. I have taken hundreds of birds with it with only one memorable failure: A fast passing teal was in my sights. I only had about half a second to take my shot using steel pellet duck loads. Upon pulling the front trigger, my finger slipped back and also pulled the rear trigger a fraction of a second later. The double recoil caused the trigger guard to smash rear-ward into my right middle finger breaking the bone. This was over 30yr ago but it still hurts me to this day. I still use the sxs but have never had it happen again. I did kill the duck so, I guess it was a success? IMO it was an epic fail. Still, If I was going into tight bush after a client's wounded DG animal, I would want a DR over about anything else. For non-PH client hunters, I think the DR is not the best 1st choice most of the time except for ele or rhino. Different strokes.