Thread: Lightweight Barrels and "walking"

Gidday Folks

Recently I've been analyzing some groups from various rifles that have passed through my hands (quite a few haha).

The thing that strikes me is how many 223's I've had with light barrels that will open up group sizes as they get hot, I can't recall a single "light" 223 I've had that will fire more than 5 rounds continuous and hold a decent group. The CZ527 I have just now is horrible (still perfect for hunting, 3 shot groups are spectacularly good) after 5-7, the Remmy Model 7 was just as bad, and a Tikka was only a wee bit better. Howa's and Savages I've shot about the same as the Tikka

Is there a barrel manufacture type or a maker that produces consistently accurate lightweight 223 barrels that'll shoot 8-10 shot groups.

Thoughts?