There are a few factors as to why certain guns won’t and certain guns will , due to time constraints I will list a few .Let him defend his argument - I want to see how it aligns with my test parameters/conditions. Maybe we are in agreement, but until we start getting some specifics and trends it's hard to separate the heat from the flares.
If someone can say "I have this rifle, barrel contour, length, cartridge, general accuracy, and I see X when Y" and we can be specific about it that is a better discussion than we've been having so far.
1: exit timing , if you shoot a 6 charge graph and the patter is trending flat with all powder charges , you will not see much if any change would the changes of the tuner.
Solution : change to a different weight bullet . Then re run a 6 charge graph.
2: Recoil force ratio /weight offset to dynamic flexibility ratio.
If you are shooting a 6.5 need more or 6 dasher with a truck axle barrel even if the exit time is good for a pattern the amplitude can be so small the it is hard to see any adjustment making a difference .so the barrel should be around .950 or less in diameter to see the tuner work with the lower recoil force . But with a 300 win mag the chances are much better due to the recoild forces increasing you can see more amplitude or extremes of change in poi height.
3 :Testing protocol. As was stated , no rubber feet . Ground or concrete bench and wind flags at all times . I do not care how good you are the groups will always improve with flags , I found out the hard way . Absolute 0 parallax. When you set your parallax and your crosshairs is steady , go to each end at the edge and see if the ends of your crosshair line are bending up and down .if they are you have not eliminated the parallax to 0. That alone is worth 1/8th of dispersion in your groups . These are all factors that can totally mess the test up . And last point of aim , never aim at the hole . Adjust your group to the side and pick a crosshair on the target . Line up your crosshair with the crosshair on the target to ensure the exact same cant on every shot and point of aim . These are just effecting variables that I have learned while testing to high repeatability so I am not saying everybody is wrong but this can help .also when doing graphs try to shoot in crosswinds only because tail or head winds can cause vertical dispersion even at 100 yards.
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