It's easy to spend just as much tweaking a Remington action as buying a custom action. Oh, it doesn't seem like it at first, $650 for a donor rifle and $150 to square it up a bit doesn't seem too awful bad. Start adding up the extras and you can quickly start loosing money.
Not arguing, just expanding.
Trued Remington:
Remington 700 SPS Stainless Steel, AVG ~$700.00 (Maybe less, maybe more)
First strip rifle and sell parts:
- Black synthetic stock: ~$70
- X-Mark Pro adjustable trigger: ~$75
- SS Floorplate: ~$80
- Stainless steel sporter barrel: ~$100
You make back roughly $325. Stainless steel action cost will be roughly $375. A smith can true for $150. That's $525 and some tax for a trued action that has been tested in harder conditions than most will ever use it in. Get your smith to open the mounts to 8-40 for free. A recoil lug's ~$30.
Custom action:
They start at $1000 in Canada. Stiller being one of the cheapest options.
As Dogleg already said, extras are what ruins the deal. All of the following are superficial when it comes to an accurate and functional action:
- Bolt side release
- Pinned recoil lug
- Modified port
- Modified bolt knob
- Modified extractor
- Custom bolt
These modifications have the potential to make the Remington equal or more than the cost of a custom.