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@blackhawk8: I'm probably overthinking this, but since you posted it in the reloading section, I'm wondering if you mean cartridge case overall length/size/headspace gauges? (Not barrel chambers.) If that's the question, then I use Wilson. There are cheaper aluminum ones, but wilsons are the best. For me, they're almost indispensable to ensure proper functioning of finished ammunition in my autoloading rifles and pistols.
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