.30-06 JDJ
| .30-06 JDJ | ||||||||||||||||||||
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| Type | Rifle | |||||||||||||||||||
| Place of origin | United States | |||||||||||||||||||
| Production history | ||||||||||||||||||||
| Designer | J.D. Jones | |||||||||||||||||||
| Specifications | ||||||||||||||||||||
| Parent case | .30-06 Springfield | |||||||||||||||||||
| Case type | Rimless, bottleneck | |||||||||||||||||||
| Bullet diameter | .197 in (5.0 mm) | |||||||||||||||||||
| Neck diameter | .220 in (5.6 mm) | |||||||||||||||||||
| Shoulder diameter | .353 in (9.0 mm) | |||||||||||||||||||
| Base diameter | .375 in (9.5 mm) | |||||||||||||||||||
| Rim diameter | .376 in (9.6 mm) | |||||||||||||||||||
| Rim thickness | .041 in (1.0 mm) | |||||||||||||||||||
| Case length | 1.925 in (48.9 mm) | |||||||||||||||||||
| Overall length | 2.455 in (62.4 mm) | |||||||||||||||||||
| Primer type | Small Rifle | |||||||||||||||||||
| Maximum pressure | (around) 52,000 psi | |||||||||||||||||||
| Ballistic performance | ||||||||||||||||||||
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| Test barrel length: standard SSK-manufactured barrel Source(s): Cartridges of the World[1] |
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The .30-06 JDJ is a firearm cartridge designed by J.D. Jones.
Contents
Overview
The .30-06 JDJ is a modified .30-06 Springfield cartridge designed to be used in the Thompson Center Arms Contender single-shot pistol. The idea behind it is to replicate the ballistics of a .30-06 fired from a rifle in a Contender pistol.[1]
Currently, the .30-06 JDJ is not offered by any manufacturers. Cases and bullets for it can be purchased from various companies for handloaders.
Description
Compared to a default .30-06 round, the .30-06 JDJ contains has a smaller neck that is at a 60-degree angle. However, the biggest difference is that the .30-06 JDJ has little taper compared to the original .30-06 JDJ cartridge.[clarification needed] This allows the .30-06 JDJ to hold an extra 5 grains of water (4.875 cm3) compared to the .30-06 Springfield, allowing one to put more gunpowder into the cartridge.[1]
Ballistically, the .30-06 manages to replicate the ballistics of a .30-06 round fired from a rifle well. For example, a .30-06 JDJ cartridge with a 200-grain bullet fired from a custom Contender has a muzzle velocity of 2,504 ft/s (763 m/s), while a regular .30-06 cartridge with a 200-grain bullet with 55 grains of gunpowder has a velocity of 2,558 ft/s (780 m/s).[2]
