I had very good luck with Time tuners back in the mid 90's. But at that time BR-50 gave bonus to rifles that weighed less than 12 pounds. Mine were in the 9 to 10 pound range. Barrels were in the 25 - 26 inch range, slender and deeply fluted. Now that rifles weight 10.5 in some games and many well over 12 in ARA I don't think the light weight Time tuner works as well on heavier barrels. BUT, I have and old Martini with the heavy 29 inch barrel. I bought a Time tuner with a 10 inch bloop tube primarily for the extension of the front sight but used the tuner too. The weight was enough to see changes in group size while adjusting. If I remember right I reduced groups from low 3's to high 2's. Nothing good for benchrest, but gave some help in prone.
So my answer is I think it depends on your barrel, the stouter the heavier the tuner may need to be. TIMSAISTI. Rich