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Build cartridges exactly like this, they should feed perfectly:

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Notice the shoulder measurement?
It's .001" LARGER than the 7x57 Ack.IMP or .280 Ack.IMP.
The shoulders of both of my "factory" 9.3x62's also come fireformed at .454/5", whereas all diagrams I've seen of the case were .451".
It most definitely is not a .35 Whelen necked up, nor is the 9.5x56 a 7x57 necked up. It is a blown out case, long time before Ackley was in operation with his wildcats.

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Daryl


"a gun without hammers is like a Spaniel without ears" King George V

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