@Cooper I'd be interested to know what the COAL of your cartridge is please?
I'm re-doing my .308 loads with 178gr ELD-X today. Looking at 42gr of 2206H at the SAAMI max COAL of 2.800", that load of yours would be above the pMax of 62,000psi if it's seated to 2.800". Not by a lot, just sayin'.
My first go round with the 178gr ELD-X, I got the groups down to an inch at best. This arvo I tested some with a hottish load of 2208 / Varget and got much closer to the magic half inch, and way lower ES. This is with an 18" barrel. I have found in recent times with the heavier .308 bullets that the slower 2208 seems to work a bit better in my T3.
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