PERHAPS........
..........your HS6 load is incorrect for those bullets IN THAT GUN.
Maybe W296 is a better choice to stop the keyholing (but I know nothing about rifles).
Or maybe a switch to Starline cases, or crimping heavily using a REDDING Profile Crimp die, or trying Federal 155 LPM primers, or finally, after all else has been tried, a different bullet?
R-P and Winchester both offer relatively inexpensive JHP's.
(That HS6 load may be a bit much; little bit fast in '44 heavy'. I've used HS6 per customer specs to get a 255g up to 1200fps, but for more zoom I choose something 'slower'.)
Your results may vary.
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"all my ammo is mostly retired factory ammo"
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