It's a weird way of describing it. With typical military fmj the cup is drawn from front to back the core inserted from the rear and swagged leaving the a small section of the core exposed it your typical 303 mk vii.
Hunting and match bullets have the cup drawn the opposite way ie the base is solid and the core is inserted via the open nose which is then swagged to final shape. A lot of these match bullets like the sierra smk have pinhole size hollow points and I believe that the us army successfully argued for their use in sniper ammunition on that basis.
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