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10th, the prepared cases are polished with emery paper



However, because the cups of large BMG primers are very thick, much firing pin force is required to ignite them.

This is not a problem with BMGs, or bolt action rifles, but it is a problem with the lesser firing pin force of a double rifle.

To solve this, bushings must be made to reduce the primer pockets down to standard Large Rifle primer size.


11th, the heads of once fired 300 Win Mag cases are turned down to make the LR Primer bushings.



12th the finished bushing is cut from the 300 Win Mag case.



the 300 Win Mag case head, before and after machining to isolate the primer pocket.



13th, the primer bushing length is machined to the same depth of the 50 BMG primer pocket.



14th, the LR Primer Bushing is "press-fit" (with 4 blows of a 3 lb hammer) into the BMG primer pocket ( 0.001" interference fit)