Don't drop rounds in the chamber. Chamber them from the magazine.
Make a tick mark on the case head with a sharpie each time it's chambered. When you have 2-4 marks, rotate it out.
Rotate when there is any deformation to the rim or case mouth.
Check this out from Claude Werner: https://www.facebook.com/ATLFirearms...7565304317577/
Setback is real but varies wildly, even with a manufacturer and particular sku. Crimp, jacket composition, sealants and adhesives, grooves and cannelures, slide energy, bullet profile, case taper, etc. During deliberate experimentation some major duty/carry rounds were chambered 2-3 dozen times with no effect, and were fired, extracted, and ejected without issue. Some show setback at 2-3x. I worried about a couple of 357SIG rounds when chambering them the first time.
Setback may have serious or negligible effect on pressures, depending.
It's just not worth it. Don't download at all or as often, or buy a few extra boxes of carry ammo.
2012 National Zumba Endurance Champion
الدهون القاع الفتيات لك جعل العالم هزاز جولة الذهاب
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