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The stuff I bought certainly isn't.
It is Boxer primers (as per the label)

It is Boxer primed - but, is not reloadable due to the fact they used S&&B cases.

SMLE TESTING
For the SMLE All rifles were tested for accuracy by the Small Arms Inspection Department at 100ft, and 10% were also tested at 600 yds. All rifles were fired from a special mechanical...

Kynamo (Kynoch - UK manufacture) were manufacturing MkVII with flat based bullets.