I think I'll follow this thread...I've been working with an 'F-class-BR' in .22lr & using a tuner...I swear, the more empirical evidence I pile up, the more it leaves me questioning everything I thought I knew about nodes.
One thing, it's not just the length & type of barrel and where the node is located in a particular load and it's characteristics but also the way we embrace the rifle, the hardness or softness of the surface the front rest and rear bag or bipod sits on, how much cheek pressure is applied...etc & etc. These other things add or take away from the 'supposed node' you think you have. These things act as a buffer and absorb or magnify the pressure waves cycling back and forth with in the rifle barrel & stock.
At least that has become the way I look at it from working with the tuner.
I may be out in left field with my assumptions but I feel there is definitely a lot we as shooters do, even doing our best sending the rounds for the best groups we can accomplish, we as humans can make a node look like something in-between nodes.
I don't think 5-shot groups as proof of a node are sufficient either...
dtknowles showed me something in one of my threads that really opened my eyes.
He overlaid 4 ea. 5-shot groups that as individual groups looked pretty good, several almost one hole groups...but looking at 20 shots that group looked a whole lot different.
These were the individual 5-shot groups @ 50 yds....the first, within that 1" circle on the left is a warmer 5-shot group...he didn't include in his composite.
This is their composite, the 4 ea. 5-shot groups on the right...completely different looking.
It leaves me questioning whether or not I'm on a node or if I'm a lousy shooter or if there's more I can do to stiffen my bench or what?
This 'node seeking business' is as deep of a rabbit hole as it gets..."gotta love this stuff!"