I think it just has more to do with the fact that the hype surounding the 7mag lured many inexperneced shooters to buy them. The old guys know their old 06 is more then enough so they were not the first in line to get on the magnum bandwagon. More of a phsycological thing then a ballistic thing IMHO.
BINGO! Kachok hit it right on the head.
In some circles the 7MM has developed a horrible yet undeserved reputation.
Lets break down what a 7MM
really gives you over the plain old .30-06. I'll let you guys go grab your own reloading manuals and ballistics charts. But I'll summarize with comparable SD and BC the 7MM gives you a bit flatter trajectory hits with about the same energy and does so with a bullet that has slightly less frontal area and diameter.
So what you
actually gain with a 7MM over a .30-06 is about 50 yards more maximum point blank range with no discernible increase in killing power.
Now here's the rub many enthusiastic yet inexperienced guys buy into the hype, go get a 7MM and have an inflated and overly confident opinion of what it is capable of, then try to make these ultra long shots on elk missing or wounding. There tends to be a bad case of over confidence associated to the 7MM and so many hunters.
Meanwhile you get the old timers shooting old reliable in a .270 or an 06 or a .257 Bob, whatever, who simply don't take shots that they aren't sure about making and they tend to cleanly kill way elk than the your average once a year bubba with all the cool tools on his back.
It reminds me of Eric Hartman The top scoring fighter ace of WWII with 352 enemy kills. He was asked once what his secret was to being such a fine aerial marksman. His reply was that he wasn't good shot at all he simply never pulled the trigger unless he was close enough to assure a kill. In his book he stated that he like to close to within 50 meters before he would fire on his enemy. So much like a very good hunter, shooting was secondary to his expert maneuvering and stalking skills.
As Col Jeff Cooper said if you can get closer, GET closer, if you can get more steady, GET more steady.
If a guy wants to put in the time and training to get to where he knows how to shoot long range and he has the knowledge when to pull the trigger and when to let it pass I have no problem with that at all. Go for it, but know when to say when. Most hunters do not have the discipline or experience to know when to not pull the trigger.
Experience comes from bad judgment but you let be the other guys bad judgment and learn from their mistakes. I pulled an amateur boneheaded mistake last year during deer season. It happens!
PS
Now that I am thinking about it the longest range one shot kill I've ever seen on an elk was in 1982 or 1983 up in the Rio Costillo. Long before Range finders were available to the general public. It was my hunting mentor Bob Ward (RIP buddy) shooting his beloved .270 Weatherby and a 150 gr Partition. He had one of those old Redfield wide views with the stadia ranging lines in it. I need to go back to the spot and laser it, but the lines told him to hold for 600 yards and he killed a big dry cow with the first shot. I've seen him make several other one shot kills at beyond 500 yards with that old rifle too.
Bob was an artist with his .270 Roy and had taken two grand slams with it. Killed moose and grizz with it, had hunted just about everything there was to hunt in Africa with it including a huge Bongo back in 1984. It goes back to time and familiarity with the rifle. Bob had been a PH in Rhodesia and I know had operated with the militia during the war. Whether or not he did any long range rifle training with the Rhodesian military is now lost to history but I'd guess that he did. He knew quite a bit about long range shooting, wind doping, mirage, positions, breath control, ranging, ETC.