Originally Posted by John0313
I’d suspect “S” bullets were at play, maybe even milsurp loads.

S bullets don't hurt J bore drillings. S bore loads in some drillings that were made as light as possible if fired a Lot will loosen them up. The S bore loads were hotter. That's where some trouble lies.

Heym drillings are not my favorites by a long shot. Over half of the ones I've encountered were off face, especially the ones in 270 and 30-06.

This gun shows a history of heavy loads. It's an 8X57JRS.

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