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could it be possible to rebarrel it to a more common caliber like, .308?, just wondering, as long as factory ammo is avalible, I have no problem with it being .303
Sure, but there's more involved that just rebarreling. You would have to have the extractor reworked and possibly the bolt face to fit the .308 Win. case head. You may have to have the feed lips on the action reworked for the .308 case.
Actually, the .30-06 would be a better cartridge, in that size than the .308 Win. The American versions of the P14 were chambered in .30-06 Springfield and it was called the 1917 Enfield.
However, the bolt face of the rifle in .303 British should be a bit larger than that for the .30-06, so it may involve welding up the bolt head and that would involve re heat treating, new machining for the .30-06 case head. It's probably best just to leave it as a .303 British unless you want to get a bunch of money wrapped up in it, far more than it's worth.