The cost of rebarreling for a project like this is probably going to be in the $400-$500 range by the time it is finished. Most of the 1903 MS rifles and carbines imported into Canada were during the late 1950s and early 1960s, and almost every one sold then had a bore like a gopher hole.
In the end, you are going to end up with a Gunsmithing job that will cost 4 to 5 times what the rifle is worth, have a rifle that is difficult to find ammunition for, and will never be able to recoup that money if the rifle is sold.
You will also have a rifle that is very difficult to scope, and while the MS action is quite slick to operate, the position of the bolt handle is not the best for fast repeat shots. Also, if a part breaks, they are quite difficult to find.
It would be much better to check out the TRADE-EX website, (Gunnutz sponsor-link above T.E.C. Trade-ex Canada) and look in their sporting section at some of their Husqvarna Factory made sporting rifles. For about $250, if you choose wisely, you can find good 6.5x55 or 8x57 rifles, and a lot of them are already drilled and tapped for a scope and maybe bases on them. Also, many have bolt handles already bent, and even aftermarket side safties. Ammunition for either calibre is fairly easy to purchase as both are more popular calibres.
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