Measuring neck diameter with calipers is an "iffy" proposition at best. A small burr on the case mouth, a slight angle to the calipers, or even just placing too much tnsion on the calipers can give distorted readings. Improper neck tension can make preojectile...
Stop guessing about your primer pockets. Know for sure with the Swage Gage Primer Pocket Gauge. Available for Small or Large primers. Check primer pocket depth and diameter. Use the "Go" end of the gauge to check primer pocket depth, if any crimp is properly...
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