I don't want to be condescending, but....based on the fact you never use flags and the above comment -it appears you do not have a clue as to why it is essential to run rounds down range in order to net the absolute maximum accuracy. True, you might be able to "pick" your way to small groups....but that method has it's pitfalls if you don't know how to compensate for them. This applies to all shooting, competitive or not.
IMHO custom actions are a shortcut to the learning curve of shooting accurately....the chances are orders of magnitude greater that coupled with a decent barrel you will have a gun that you can trust. Trust is huge.... the reason for errant shots will be narrowed down to other factors....not the gun. This is the quickest way to learning to read the wind. Attempting to make wind calls with a gun that throws shots will waste time and money and EXTREMELY frustrating.
My understanding is that "running" rounds down range is for the purposes of capitalizing on a wind condition that is known and its effect on bullet trajectory. The idea being to get as many rounds downrange during that condition, before the condition changes, and is in fact exactly what I did during my first 1000 yard match (1st match ever). I am confident this is why I was not last (NBRSA match), a real shock.
I have not used wind flags, but have already indicated I intend to purchase the Graham flags. I will need these to best develop loads.
I fully understand how the use of a custom action can build trust, as explained by others earlier in this thread. But for me, as evidenced by the title of this thread, I want to understand just WHAT and HOW a custom action contributes to accuracy thereby removing itself from the accuracy equation. Some here have provided good answers and resources (the Vaughn book). But if there are no good answers, then there should be no difference in trust vs a factory action. I already understand that if you run the bolt, a custom offers unrivaled operational speed.
That said, my intent is not to shoot the absolute smallest group by using wind flags, "running" the bolt, etc. As indicated earlier, I want to achieve maximum accuracy for the equipment I choose to use in the conditions presented to me. My chosen equipment will not result in absolute maximum accuracy, and that is OK. That equipment would be a rifle on a bipod and light rear bag, and fired when wind conditions as I observe them (blowing vegetation, smoke, etc.) are something I feel I can manage. The circumstances that I might be presented with if I were a sniper or varmint hunter.
That said, I still need to do load development and need to remove me, the shooter, out of the equation as much as possible. For that, I will use the flags and use my coaxial front rest, heavy rear bag, etc. Without a dead-nuts BR rifle, it will be harder to separate gun performance anomalies from the shooter, but I don't want to shoot a BR rifle in BR rifle setups.
In the end, I want to be one of the better shooters that can fire good groups without special aids or the use of single purpose rifles. I got great satisfaction out of shooting 5 shot 2.75" groups at 300 yards out of my AR-15 (built for accuracy to the extent one can be), on a bipod, with a quartering stiff headwind. Hardly BR performance, but for an AR, on a bipod, in that wind, I felt pretty good about it.
Phil
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