I have Four 6 BR's on non trued Rem 700's that will shoot tiny, tiny groups, and 6 PPCs, and on and on. How about a 31" unturned blank, completely freefloated on a 700, non trued 700 with a Mike Ezel tuner on it, caliber is 6 XC...NOt politically correct by any means. Rem 700's are not supposed to be able to support a 31" unturned blank, but I have a shelf full of barrels that say other wise. Also a flock of 28" unturned blanks on 700's.
Here are some groups of the 6XC:
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The three groups above are adjusting the tuner, boring accuracy. 6ppc's and 6 BR's shoot tiny groups...Mike Ezel tuners make life easy.
It sure helps to have the bolt face square on taking measurements, but anyone worth a dam can work around that.
Bottom Line, truing helps new guys in having confidence. If a thing gives a guy more confidence, then by all means do it. Truing also eliminates a variable that the gunsmith will not be blamed for when the shooter does not know how to clean his rifle, reload with any degree beyond beginner stage, shoots off of his coat laying across the hood of his truck or in the dirt.
I like Borden actions and have had a flock of Hall M's and Panda's.
When do you want to true an action, when you are using a platform from Ruger, Winchester(especially pre 64), and Mausers.
If a gunsmith wanted to promote doing something that really improved accuracy, it would be a barrel tuner, and Mike Ezel's (gunsandgunsmithing)...almost as good as discovering girls!
http://forum.accurateshooter.com/members/gunsandgunsmithing.551050/
If I were a gunsmith dealing with the public, I would true every action that came through my shop...a guy in business in today's politically correct world, has to walk the fine line. How in the world is a guy in business going to be able to offer any kind of an accuracy guarantee if he does not true an action? Dumb phucks out there do not know how to clean a rifle, know how to measure the COAL to the lands, don't know how to size brass to fit a chamber, bench techniques are worthless shooting off of po go sticks, and have absolutely no idea what a wind flag is?