ronn Posted May 4, 2019 Share Posted May 4, 2019 what’s the difference between a 556 case gauge and a 223 case gauge thanks Link to comment Share on other sites More sharing options...
Tom Freeman Posted May 5, 2019 Share Posted May 5, 2019 Not a huge amount. 5.56 chamber headspace is larger than 223 Remington by .0005-.0006. The big difference is how far the bullet travels before it engages the rifling. Link to comment Share on other sites More sharing options...
858 Posted May 9, 2019 Share Posted May 9, 2019 The case gauges are the same. Link to comment Share on other sites More sharing options...
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