@RyanG: My dad always said that the only dumb question is the one you don't ask.
I think the principle is the same as for your 6.5-.284. The same headspace go/no go gauges work for all the belted cartridges, with the exception of the .450 marlin. At least that's what I inferred from the PTG website, which is a fun site to visit. You may want to check there at: shop.pacifictoolandgauge.com
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