Thanks for the advice guys. I've been proceeding somewhat like victorcharlie mentioned. The top part of the action seemed to drop right in after just a tad more additional sanding. The triggerguard still goes in a little tight nothing serious.
I took a wooden dowel wrapped in 60 grit and was able to notch out a spot for the bolt handle pretty quickly. After I had it deep enough I went back over it with 120 grit to smooth it out a bit more. For the sharp corners I ended up taking the 60 grit paper to those too and just working off the hard edges (for the top I basically just cupped the paper in my hand and kept turning it over the tip of the stock until the corners started rounding out. It's not really completely rounded at the end - just the corners are smoothed out and rounded (but the tip is still flat), but I think I've done about as well as I'm going to get given my current skill level
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After that I've started working on the surface of the entire stock. The general roughness was taken out by a good pass of 120 grit paper followed by some 320 grit, but there are still some tooling marks and such visible (hard to find all of them though). What I've done is gave it an initial rubbing of Formby's Tung Oil which makes the imperfections easier to see. I let that dry for roughly 24 hours and then go back over it with a close eye looking for tooling marks, deep pores, or any "scratchy" looking sections from previous sanding. Once I identify a problem area I hit it with the 120 grit paper, followed by 220 grit, and then 320 grit which has worked well at smoothing out most of those areas. After sanding a given area though the dust makes it a bit hard to see any more problems, so I've been just applying another overall coat and repeating the process.
I'm about to the point now where I have the surface smoothed out as much as I'd like. I put on another coat last night and when I get home if the visual inspection checks out I'm going to transition to 400 grit paper across the whole stock between coats. After several coats with that I've also got 600 grit paper to move up to. After that I ran into a problem in that the hardware store didn't have anything between 600 grit and 1500 grit. I'm going to try and go between those two directly but if that doesn't work I'll try and find an intermediate somewhere.
So far it's turning out well. This will be my first stock that I've started from scratch sanding and finishing. I've stripped off and refinished quite a few before, but I always took for granted how much work actually went into getting the stock surface smoothed out after the cutting/tooling stage
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The only negative is that I had Richard's install a 0.5" recoil pad, and when I went to remove it it's both screwed and glued on, and the glue seems strong enough that I'm not getting the pad off without damaging something. As such I'm having to do my best to mask and avoid the pad when finishing. That really, really irks me as the sensible thing would seem to be to just take the pad off when finishing and replace it when the finish is applied, but I'm pretty much stuck working within these limitations.
Thanks for the advice.