Here is the biggest benefit I see to turning necks on a long range rifle. ES/SD. The more consistent the brass (including necks) the easier it seems to be to get them low with a big magnum. Small capacity cartridges, not so much. Starting the bullet down the barrel straight doesn't hurt anything either. Well prepped brass is just more consistent and often easier to tune. Very important in a hunting rifle. Not so much in a high volume competition rig. You are not wrong, but the requirements are different.While it is fun to try to squeeze every fraction of an inch of precision out of our rifles there is little to be gained by turning necks unless you are shooting a full out, fully rested bench rest rifle. Most rigs and rests will not have any significant improvement from neck turning unless your chamber/neck thickness requires it for chambering. The above charge test was shot with a 22lb full out F open gun/fully rested with minimal contact with the rifle. I have turned necks for several years for my competition rifles but have found that it is not necessary to win in 600-1000yd f-class. I’ll put on my Nomex suit now
Orange, while I agree that we have different requirements, to be competitive in F-class requires a higher degree of precision than LR hunting unless you are dealing with very small game. The big difference is with my competition I shoot known distances and can tune specifically for that distance. That means that I can have a load with a bit of a high SD of velocity and, if I have it tuned to the distance I am shooting, It can get very small groups. However, a common misconception is that if a load shoots small at closer range (let's say 100-200yds) and has an ES in the low teens or lower and an SD in the mid/low single digits it will shoot just as small in MOA at any distance in the theoretical dead calm condition. My best loads that shoot well from 300yds to 1000yds are, almost without exception, not the ones with very small ES/SD. The point I am making is that with proper loading techniques which include consistent neck treatment, the right neck tension, the best primer for that load, properly developed charge weight, and charges less than 0.1gr one can arrive at a gun that will shoot .5 MOA much more often than not....without turning necks. I have been the full circuit and I have found that with good quality brass I cannot find an advantage in scores. My time is more productive to improving my scores by shooting more in different conditions. Just my observations. One thing for sure is that, if properly done, neck turning will not hurt precision.
The good news is 100 cases will outlast the barrel on many of the really overbore magnums, so its just not that much extra work. The extra effort will result in a more consistent bullet release, low SD's are easier to find. If it was a high volume rifle, I would try and find a load that would be good enough without all the bother. And, this is usually achieveable with a target cartridge. They on average are much easier to tune. You are not wrong. I stated that earlier.JE, You misunderstand me. I certainly agree that an ethical hunter, of which I consider myself as I was a hunter way before a target shooter, should have his rifle capable of hitting where he is aiming...at any distance he/she is shooting. I am just stating that to be competitive with the folks I shoot against if my rifle cannot hold an X ring in a dead calm at 1000yds for 20 consecutive shots I will not win a major match. I do not need .5MOA precision to ethically hunt LR game unless the kill zone is less than a 5" circle... I need consistent 'minute of boiler room'. However, the tighter shooting the rifle, the better and one should strive for reasonable precision. I made my comment aimed at those who feel, based on interweb lore, that you have to turn necks to have any real precision. I hate to see relatively new shooters go and spend a small fortune on gear that will not make a difference until/unless they have the skills/equipment/demand for that degree of minutia in their case prep. I am just presenting a contrary point of view. I consider all opinions in this thread valid.