I had a bit of a play in the shed.
Hornady shellholder on Lyman priming tool, noticeably larger hole, and plunger reaches flush at best. Shellholder 0.385 inches thick (bottom to where face of case sits).
Lee shellholder, marginally better than Hornady? 0.365 inches thick.
Lyman shellholder, plunger goes well beyond flush. 0.353 inches thick.
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