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Is your Bergara the 16.5 or 20 inch?
Your top speed of 2550 is very similar what I get from my “warmish” load in a 24 inch barrel, so allowing for velocity loss from shorter barrels is probably...

What makes you sure it's not a hot load?
My load for another 308 using 178gr bullets and 2208 is 42.5gr, and I think that's getting warm. In my Bergara BA13 I load down using 30-30 bullets so can't...