What's the advantage of Ruger Mark III's fluted barrel?

[alvin]

Fired 200 rounds CCI .22lr from it in range. It worked very well, no issues met, and it's very accurate... Shooting a little bit to the right, but that's my habit related. I did not carry tool with me today, will adjust the rear sight a little bit next time.

Field stripping for cleaning is not easy on this gun. Putting back took even more effort. Try and fail a few times, that's still manageable. So far so good.