Over the last 45 years or so, I have discovered that some rifles like free-floating, some like a full barrel bed and some prefer a single pressure point near the end of the barrel channel.
As for light-weight barrels, they tend to heat up and warp after multiple shots.
They recover much faster at 10 below zero than they do at 80 above zero.
Here are some examples.
My m-700 Titanium Mountain rifle has a very thin barrel. It heats up immediately and strings the groups after 3 shots. It came with a pressure point in the barrel channel and it shot 3 inch groups out of the box. I then free floated the barrel and it shot great groups as long as I waited for 3-4 minutes between shots.
Then I glass bedded the whole barrel channel. The groups are a little larger than when it was free-floated, but they stay together a little longer when the barrel heats up. I can get 5 shots into a groups rapid fire before the group opens up, when it was only two shots before.
Now on the other hand I also have a M-98 Mauser that has a fairly heavy Douglas #5 tapered barrel mounted on it. I chambered it in 7x57mm Mauser back in 1973. Due to a goof while inletting the stock, I elected to glass bed the action and barrel channel.
Here is how it shoots after 38 years of use.
All groups I publish are at 100 yards: