Never being satisfied is one of my biggest issues. I had been shooting with Slug A .25 liner and NSA 43.5 grain right at 900 FPS and excellent accuracy for a year. Even shot a 238 with EBR target in swirly winds at 100Y. Then I read all about this and other posts the 38.9 NSA, so tried them, but bumped up the power a bit so I shot them at 960 FPS. Very good results also, but hard to tell in windy conditions which is better. I did get the occasional "flyer" as noted above by more than one shooter, and honestly never got flyers with the 43.5. So 38.9 4/5 were better, but 43.5 5/5 almost always better.
So I decided to stick with the 38.9 NSA for a while since I had 3 or 4 boxes in the Slug A until RMAC. I saw at RMAC that Keith G had done really well with the Superior Heavy .25 and 41 grain ZANs at 940 FPS. So, silly me, thinking if I got a .25 Superior Heavy and shot the 41 grain ZANs at the same speed I would be golden - forgetting that I bought ONE liner, not a dozen to run through and test to choose the best. Needless to say, performance was good, but not as good as the NSA 38.9 or 43.5 in Slug A liner. So now I'll try the NSA 38.9 in Superior Heavy, but probably end up going back to where I started with the Slug A and NSA 43.5 at about 900 FPS.
What kinda tweaked my mind was BELIEVING that the first tune I did over a year ago with the NSA 43.5 would be the BEST tune for my gun. It was hard for me to accept that, so of course I had to try many different combinations before going back to the future...