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For those looking for the "spec" of M852, see: TM43-0001-27, ARMY AMMUNITION DATA SHEETS SMALL CALIBER AMMUNITION, Section 11, page 31

Until relatively recently, most snipers used the issue ball of the times. Not much "standard" ball ammo that does NOT have a mouth crimp (or in the case of .303 Mk7, stab-crimps on the neck.

The...

Crimping is probably of no value for ammo used in slow-fire bench-rest or target work with bolt-action rifles.

HOWEVER, in semis, (or full-autos), it is a "good thing", because the ammo gets...