As the barrel heats up and if it touches wood anywhere, then the groups open up dramatically. It's one of the reasons that good sniper rifles "float" from the receiver.
My wife has almost a dozen No.4(T)'s (Longbranch and UK). When she shoots for grouping accuracy or zeroing, she quits after the barrel gets hot, as it's a waste of time and her groups open up dramatically.
Regards,
DougInformation
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