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I don't have any .307 brass to see what might have to be done, but besides opening up the bolt face, I do believe you might have to alter the feed rails a bit.
You would have to be very careful in loading the magazine, placing the rim of each case in front of the one just below it, otherwise you will have a jam, sure as God made little green apples. Not the best situation for a fast second shot or if you have to reload the magazine in a hurry.
One thing you might take into consideration is that the .307 has been pretty much of a sale flop and the brass just might be discontinued without warning at any time.
Without knowing what type of game or shooting regimen you're planning on, it makes it difficult to try and advise you on a substitute cartridge. The 7mm-08 is a good one and no alterations of an action would be needed. Ballistics are similar to the 7x57 mm Mauser. I really like the 7x57, but I suppose it's considered a military cartridge as well, even though I don't think any country still uses it.
There is also the .260 Rem. to consider. ballistics similar to the 6.5x55 Swedish round.
Personally, I really like the .358 Win. (8.8x51mm in Europe), but ammo and brass can be difficult to find. Recoil would be a bit more stout than from either a .308 or .307.
I hope all my ramblings have been of some help. No one else seemed to want to tangle with the question.
I think the conversion to .307 is possible, but considering the brass situation, it might be a good idea to buy a goodly amount if you do take that route.
Paul B.
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