This is all interesting. The last Western manual I have lists 25.8 gr max for the Hornady BTHP in 5.56x45 NATO. Aren't they 65K psi? (Yes, I know the .223 chamber is tighter)

'Four legs good, two legs baaaad."
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"Jimmy, some of it's magic,
Some of it's tragic,
But I had a good life all the way."
(Jimmy Buffett)

SotG