.223's and burnt out barrels

[model 70]

how easy would it be to wear out a .223rem barrel vs. a much slower round? would you have to let the barrel cool longer between shooting round? on a slower traveling cartridge, does the barrel heat up as fast? i LOVE shooting my old mans .17rem due to the low noise and recoil factor aswell as it's ability to make full pop cans go SPLAT but i fear i'm wearing the barrel thin. plus, i want a plinker/varminter of my own and the .223 seems like it would serve both purposes nicely.