I'll throw in my $0.2 here... I just took delivery of my first custom rifle for PRS shooting and dont have a ton of time with it yet, so time will tell whether it's better than the Bergara I was shooting in Production Class that I sold when I got it (that gun was a .3-5MOA gun once it was broken in with handloads... .75-1MOA with factory ammo).
What I will say is this, I think a lot of people kid themselves when they are adding up the cost of "customizing" a factory rifle. The Ruger RPR is a perfect example of this, by the time people have swapped on a pre-fit barrel, new trigger, new stock, new pistol grip, and new handguard... they are 90% of the way to custom rifle money and have easily doubled or trippled the cost of the gun. Will it shoot accurately? Sure, but you cant go and say that your $1000 factory rifle outshoots my $4000 custom, because it's not a $1000 rifle anymore.
There's obviously a middle ground somewhere in there, but the reality is, people never properly account for how much their upgrades are actually costing them. Sure, you can buy a decent Remington or clone for $700-1000, then you add a trigger $250, decent stock+DBM or chassis $1000+, bedding $250, thread the muzzle + brake $100-300 ish and now you've spent somewhere in the neighborhood of $2000-3000 all in and you still have factory action, factory barrel... if it shoot well, great! but does it shoot the same when its clean as when it's 100-200rds fouled? Does it shoot the same cold bore vs smoking hot after a 10rd string on a PRS stage? How long do you have to spend cleaning it? How many components did you burn making it shoot well?
So go buy a Bergara Premier then? Ok, you are out $1500-1800, thast pretty good, and it'll shoot well too. If you stop here and dont mess with it... you are doing well. But do you like the stock it came with? Is the barrel twist rate and contour the one you wanted? If not, you either have to deal with it, or pay to have it changed.
Customs are not nearly out of everyone's price range as everyone tries to make it seem (Im deliberately excluding high $$ shops like Gunwerks etc.. as that's an entirely different animal).
Case in point, had an old Remington 700 SPS Tac that had been re-crowned, tuned Timney trigger, tac bolt knob, and bedded in a Manners T6A. That gun was a solid .5-.75 MOA gun after all that work was done to it, I bought it from a friend for $950. If that had been the end of the story all would have been perfect, however...
The issues: gun had hard primary extraction, so I sent it off to the smith who had done the re-crown and bolt hand work to have it looked at and corrected. Very long and painfull story cut short... they found voids in the factory handle and couldnt re-time it on the bolt, so it was going to need to be replaced... for $400 (nearly 50% of what I paid for the rifle), so my natural thought was, have them blueprint it and spin on a new barrel, but then I am almost $1500-2000 deep on a factory action ($400 for the new bolt, and $1200-$1500 for a blueprint/re-barrel).
So what did I do? I parted out the Remington and sold everything and had my Smith build me a full custom with the exact action, barrel, stock, trigger, and bottom metal that I wanted with no compromises... all for only about $1000 more total out of pocket vs. sticking with the Remington and old stock that didnt fit me.