I'm far from being an expert at interpreting ladders, but it looks like you have a pretty good node at 50-51 grains.
It's interesting at the POI change between 49.7g and 50.0g.
How was the brass at the upper end loads? Flattened primers or sticky bolt? Were you letting the barrel cool?
I'd do it again at 200y with just the upper end loads. Say from 49.5g and up until you get pressure signs.
Since I a hunting guy, I really like it when the hotter loads give the best groups.
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