I have had every Remington model 7 caliber ever made, plus a Ruger 77 ultra light in 6 Rem.
These ultra light barrels can be a nightmare to tune. A muzzle break was the answer to all of them shooting very well.
As I stated earlier, many accuracy gunsmiths that offer a guarantee in how their barrel shoots like a #4 shilen contour, and prefer a #5 shilen(3b). Make them as short as you like, but make them rigid.
Muzzle blast is a valid concern for many, you rarely ever hear of anyone speak of this, but I had guys that did not like a 20" 243 at all!
I hunted with #2 Shilen contours with several Sako A1s chambered with nice 17 Mach 4 reamers and 17 Remington with zero freebore-turn neck. Since they were 17's, I still had some rigidity, and were very, very accurate. These were the best ultra lights I have ever owned and they shot 3/8".
One thing for sure, ultra lights can be harder to shoot especially on longer shots.
Light weight rifles kick more, and this can contribute in making them harder to shoot well, repeatedly.
Accurate rifles that weight between 7.5-8.5 lbs(with scope) seems to be a good balance.
A new world opens up to a guy that has $2300-$4200 to spend.
To me, a rifle will swing the same if it has a 25" or a 20" sporter barrel, the varmint barrels is where the swing slows up.
CZ 223 with 20" and Tikka 223 are very light rifles and are accurate.