Sometimes yes, sometimes no - Limbsaver Sharpshooter X-Ring Barrel Dampener

Tried this on my Ruger 77 17WSM. I was skeptical that something so inexpensive would really work. I was frustrated with the Ruger 77. It would 5 shot group of 2 inches at 100 yards and now slightly over 1 inch. This made the biggest improvement after pillar bed, bed, free floated, trigger work and bolt work. Then tried it on my Anschutz 54 no improvement. (bigger barrel size)