In regards to a savage with a new barrel, or any other bolt gun rechambered for 7.62; As I understand it, due to the relatively weak shoulder and large amount of taper the 7.62x39 round has, it is difficult to get it to feed properly in guns that were not designed for it. These two issues can be visually seen in the aggressive curve of the AK mag.
I suspect this is part of the reason so few guns are chambered in it world wide. With as popular as the round is, and smaller size of eastern European game, you would think it would be popular. But, as far as I know, there is only one Yugoslavian factory making them, that is the same one that the Remington, Charles Daily, Interarms, etc is based off of.
The CZ appears to be the only other unique gun I've found. Not counting the Enfield re-chambered in x39.
Dannix: I've found a commerical "thumper" x39 load that uses a 220gr bullet. Talked with a New Zealander that got 180gr cycling in his AK. I plan to use 220gr if I stick with the 1:9 barrel the cz comes with (although cut down) and 240gr if I replace it with a 1:7. I've also found molds for casting 250gr. A nice part about x39 is that it will be factory brass, which is small issue with the Spectre, Whisper, etc. I had considered trying this with an AK, and before that an AR, however, I want it quiet which pretty much rules semi autos out. Then again, I do have a registered SBR AR so I'll probably do a whisper at some point. I guess if this works well, I would consider a 7.62 AR, but mags kinda suck. As far as 300 or 338 accuracy, it's great. The problem is the bullet moves slow and wind has a lot of time to effect it. The other issue is that the bdc is similar to a .22LR, it may be difficult finding a scope that will have enough range to get you over 300 yards. I'm planning on 200 yards ideal, I'll try 300+ but I won't cry if it becomes hit or miss.
shaman: I want one used as well, but it seems they rarely sell. So, even new I think it will be a good purchase. If it doesn't work for me, I know it will sell.