Quote:
Originally Posted by amosfella
6.5 are standard small rifle, 7.5 are magnum small rifle.
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Not quite, the 7-1/2 are standard small rifle primers, the 6-1/2 are special primers for the very small capacity/lower pressure cartridges like the 22 hornet. The 6-1/2 primers are not recommended for the standard pressure cartridges like the 223rem.