RCBS makes a tool called a Precision Micrometer that measures the length of a fired case. As I recall, the 223 REM has a 0.010" range that is allowed per SAAMI specs. I have a factory Savage that is 0.0002" above the minimum, and several other, including a couple of NATO chambered ARs are right at 0.006" above the minimum. Your new rifle may be fine. You may need to segregate the brass for the new rifle and just load for that length. Just one opinion.
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