I figured I would ask for help with this on this forum. I have a fired round (range pick up) that was fired in something (not the correct gun) that left the neck opened to .327 I have no idea what it could have been. Perhaps some of you may be able to figure it out. Data and pics on Reloading Forum. Thanks in advance The topic is "Anyone up for a Puzzle" , JB

How about an 8mm which is .323 bullet diameter but once fired the case would open and allow a new .323 bullet to fall in. This is provided the .327 is an inside case mouth measurement.
Take care
470 Mbogo

Probably a 8x57 or a re-chambered 8x57 from a slop (battle) chambered military rifle....they have excessive necks to allow for dirt, mud, ice etc.