Years ago I got a Cetme from Century Arms, new rebuild with existing parts, it was a jam-o-matic. Read that you put 5 to 600 rds through them and the parts would wear in and gun shoot fine.

Ordered 1,000 rds of .308 with 147 gr bullets and they came in a cardboard box like Ron_C had to my work address. Our receiving manager would always joke with me, that when he received heavy items for me he "was careful in handling or they might blow up."

Would laugh it off, but after receiving 1,000 spire point cartridges in a cardboard box and seeing the many dimples-some dents in primers, wondered if a UPS guy had ever been surprised by a discharge after heavy handling?