Update. I'm the middle of development and forgot to heed the above advice. Lost both about 2m forward. Insulation tape holds them tight. Getting good readings now.
Got a good load to prove on paper next. 69.5 gr 2217 150gr bst @ 3100fps from 20.67" barrel. 270WSM. I think velocity is hot but less flattened primer than 69gr.
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