The 30-06 JDJ was developed from the 30-06 Springfield by
maximizing the
case length and making a 60 degree shoulder angle to increase case
capacity for 70 to 75 grains of water volume, for increased power capacity.
The 30-06 was developed by J.D. Jones
of SSK Industries for the Thompson/Center Contender single
shot pistol or rifle with a special 15"
SSK barrel.
These cartridges were produced by Quality Cartridge Company, so they
are considered a proprietary cartridge not a wildcat cartridge, unless you make your own by fireforming or have very expensive equipment.
150 grain soft point
See JDJ vs regular 30-06 in picture
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