Re: 17 Enfield action and Douglas Premium barrel
I have build many a rifle on the P17 and P14 enfields. They are in the same catagory as the 03 springfields, you should true the action or at least lap the lugs. I have a 378 WBY Imp built on one, single shot. They are limited in magazine length, im sure you could rework some bottom metal similar to an ADL type box system.
I would go the Dayton Traister system, it is by far the best and trigger pull is very good, mine out of the box is 1.5#
You can get a blank stock from Lone Wolf or Manners and fit the action into it, its not that difficult. They may even inlet for it, drop them an email and ask.
Douglas barrels are a mid to upper level type barrel, not quite as good as the major barrel makers. First you have to say what you call a good shooter? Sub MOA groups? Sub .5 MOA groups? How easy the barrel cleans or breaks in? In my opinon the top barrel makers take more time in hand lapping and quality control. The Douglas barrels i have used in the past, and that has been a lot of them, all were shooters in the sense they were better than factory barrels i replaced. They have increased the prices and are getting close to that of some of the top makers, if your going to spend 300.00 for a XX Douglas why not put the extra 50.00 or 100.00 and get a top notch barrel. For long range rifle building you have to use the top materials, good straight actions and a solid stock to mount it all into.
I see no problem with the action as long as it is good and solid, straight and true. Make it into a single shot, you will have a fine rifle. The P17 has the 06 bolt face so you have to do some work with it and the extractor. The P14 has the 303 british bolt face which is good for building the large cases on. Both are controlled feed actions, IE. mauser type claw extractors. The Brits semi copied the Mauser while designing the action just before WW1 broke out, the US made most of the rifles for British. We then made our model, P17, when we entered the war. Just a bit of history.