I would suggest an awful lot really boils down to several factors.
1 Does the shooter REQUIRE an extremely accurate rifle? if a man buys the best rifle made and does not shoot it well, this is a waste of big money.
2 Can the shooter justify and afford a custom rifle, most rifles will shoot far better than the shooter is capable of, there are some who practice alot and have the science of shooting accurately down to an artform, these few can justify the added expense of a custom action/rifle.
3 Is the shooter happy with what is being offered by the big makers? Many shooters opt to go with either a highly modified factory or a custom strictly to get either the fit or the caliber they want.
As others have stated the tighter tolerances and higher overall quality of the custom made actions, are definitely more likely to give a shooter more consistant accuracy. Factory actions can be reworked to produce the same results, but the time ( spelled money) to perform the remachining and tightening of the actions tolerances is substantial. It basically boils down to the old, it is easier to do it properly the 1st time than to try and correct the problems later, thing.
Factory actions and barrels are designed , built and assembled with price point in mind, by the designers and engineers, then the folks who work on the assembly lines assemble it as a job that pays the bills this week. The chances of them encountering the end user is nearly zero, so is top quality their 1st adjenda?
Most custom gunmakers are not in the business to get rich, it does not happen, we do ok, but there are far easier ways to make big bucks.. Typically a decent smith will spend more time than they charge for, just to get it perfect. For the most part custom gunmakers are shooters who either were unhappy at what was offered or demanded more than was available, hence making their own.
The 710 was designed to go head to head with the Savage 200s and Mossberg rifles , price points. They fill that niche, they go bang,and send a bullet down range. If that is all you want from a rifle, that is what is offered. There are better choices in that price range however. To compare the 710 , which can not be rebarreled by the way, to even a 700 is like comparing Hyundai Pony to a Corvette, and comparing the gussied up 700s and the like to a Nesika, Dakota etc is more like comparing the Corvette to a Countach.
Over the last 25 years I have built many custom rifles for people, most after owning a custom will never again buy a factory offered rifle, the individual fit and finish is just not there on most factory rifles, and it is hard to go back to 2nd place.
Accuracy is also a big thing for many. Weatherby now guarantees their rifles will shoot inder 1.5" 3 shot groups at 100 yards, I would not even think about allowing a rifle I built out of my shop if that is as good as it could shoot. I accept 1/2 moa, but try hard for better in most cases. ( not all calibers and configurations will deliver sub moa groupings) :mrgreen: