The heavier barrel will do better, overall, for not having a change in the point of impact during long strings of fire.
No matter how thick the barrel is, the leade is the critical "hot spot" with such shooting. This particularly holds for such cartridges as the .204, .220 Swift and the .22-250.
I've used a light sporter barrel in prairie dogging with a .223. I'd shoot three or four times and then take a break and watch my buddy shoot while my barrel cooled a bit. Never had any particular problem with change in the point of impact, as near as I could tell.
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