Quoted: I guess my most major concern is wearing out the rifling rapidly since the bore is tighter and using heavier bullets.
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They all use a 0.224" bore and most match ammo is heavier than SS109, so...
The chamber itself is tighter and a match barrel has a limited service life before accuracy starts to degrade. That life is measured in the number of rounds fired through it and it doesn't matter if those rounds are a bunch of cheap milsurp ammo in a few afternoons or handloaded match ammo over the course of a few years. Looking at it from that point of view it would obviously be stupid to waste the life of a good match barrel with just going out and plinking. If you want something for a bunch of rapid fire shooting you should get something chrome lined from Bushmaster.
Does 62 gr. or M855 or ss109 or whatever use more/denser powder to move the heavier bullet better?
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Military ammo, both M855 and M193, is loaded fairly hot, but even then we're still talking about 5.56mm. The really hot stuff like .22-250 or those new .223WSSM will have issues with throat erosion.