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The original .303" MkVII bt weighed 160 gr and was approved in Mar 1910 and had no cannelure. Production lots of this ammo failed accuracy proof and the bt was redesigned.
The new bt retained the exterior dimensions of the above but the aluminum core tip was shortened and the lead lengthened. The new bt weighed 174 gr and was approved LOC 15629 Oct 1910.
".303Inch" Labett and Meade