Yes, the Wilson gauges quickly give you an read on the ENTIRE cartridge, sizing, case mouth, overall length, etc. They're good from that sense if you have any questions about whether a round will chamber in your particular gun.
I've never found them to be particuarly necessary, but I'm not shooting the kind of sports that require me to ferret out any round that might cause a hang up.
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"The gift which I am sending you is called a dog, and is in fact the most precious and valuable possession of mankind" -Theodorus Gaza
Baby Jesus cries when the fat redneck doesn't have military-grade firepower.
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