The last several rifles I've built around a M700 were done on bare actions purchased without the bolt, trigger, or any of the other parts. I ordered three of these actions in 2-3yrs ago, placing orders for PTG bolts as soon as the actions arrived, and bought trigger pins, bolt stops & springs, etc. from Brownells. Being a little paranoid, and since all three rifles were for myself, I dialed-in each action in a TruBore Alignment 6-jaw unit. All three were within .0015" on the receiver faces, and the lug seats took no more than that. I skipped single-pointing the tenon threads, so can't say if they were off or by how much.
The PTG bolts were ordered with mini-16 extractors & .060" firing pin holes, along with PTG striker assemblies. Didn't make notes on how much I had to cut off the engagement surface (rear) of the bolt lugs, but IIRC, it was no more than a couple thou. Of course I had to dial the bolts in on the Tru Bore to take the cuts. Primary extraction with all three was fine. Since I'm doing all the work myself, I felt it was worth it to go with these bare actions as opposed to buying customs, but then I've got five competition LR rifles built on Bighorn actions, and since these were more "just because I want one" projects, it didn't make much sense to me to invest in custom actions. They all three (223AI, 6XC, 708 Improved 30*) shoot as good as I'd hoped, so I'm satisfied. I know in advance I won't be able to sell them for what a custom action-based rig would cost, but I didn't build them with selling in mind. My heirs can deal with that... But whether it's worth it to pay someone else to do this much work vs buying something like a Bighorn Origin .... well, you decide. If I weren't an experienced rifle builder, I'd most likely go with a reasonably priced custom.