Welcome to the forum.
I will answer what I can.
#2: All Savage rifles of any style can be easily swapped, and they are all interchangeable. The only distinction is whether is it large shank or small shank. As a general rule, all Short Mag calibers are large shank, the rest are normally small shank. (this is not absolute. Determine first what your action requires and then proceed. Hunters and Trophy Hunters of standard calibers are standard shank). Keep in mind all Savage barrels are of the same quality. The only differences are the dimensions, rate of twist, SS or Blued and whether they are threaded for a muzzle brake.) Depending upon the catridge you are swapping for, you may need to also swap bolt heads when changing barrels. ALso, keep in mind long action cartridges can only be used on long actions. Short action cartridges can be used on bot long and short actions. Therefore if youstart with a long action receiver, you will have the flexibility to use long or short action cartridges in the future.
3. The Nikon is a better scope. Both are perfectly adequate for hunting 0-300 yards.
4. Models that use the Axis style Mags are not a easily upgraded as standard metal-framed 10/110 style mags. I would not recommend Trophy Hunter for someone planning to upgrade the magazine system. Overall, the rifle is a fine product "as is", however.
My personal opinion about the best, long range purchase would actually be either an older, used 10/110 model with top bolt release or a Hog Hunter.
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