A couple of gems that I have heard about tuners...
Gene Beggs told me that for his tuner, given the length and pitch of the threads, that a node can be found at perhaps four places, with the same load, but that although each of these points zero out the vertical, it may be necessary to try more than one to tune out the horizontal...in the tunnel.
Another fellow, who has had great success with tuners, tunes to peak without the tuner, installs the tuner, and tunes with it to peak accuracy, and then locks the tuner, and never moves it, tuning from there conventionally. He has observed that for the 6PPC that the node seems to have been broadened with the addition of a tuner. (This is consistent with my small experience.)
One well known Australian shooter that I have corresponded with, plans to try preloading and doing it all with the tuner. I will be interested in how well this works for him. I think that the practicality of this approach may depend on how great the condition changes are that he has to deal with, but this is just a guess, based on Jackie's report that he cannot always get there by changing the tuner setting.
Jackie,
I think that the sensitivity of a given barrel to a given weight of tuner is a function of its stiffness. One fellow, who has done well with a Beggs tuner on his sporter, reported that it has no effect on his heavy. I think that your HV barrel may be more different in stiffness, as compared to your sporter, than you think. Are they both the same length?
On the barrel stiffness issue, in Precision Shooting, there was a picture of one of Calfee's rimfire, XP 100 conversion, pistols. It had the center of its barrel turned down a bit. My guess is that this was done to make the barrel more flexible, so that a lighter tuner could be used, for balance. In the past, stiffer was thought to be better. With tuners, some modification of this design goal may be in order. What do you think?
Boyd