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7MM JDJ
Discussion regarding the reloading of ammunition and tuning of loads for accuracy
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Elvis
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Joined: Jul 27, 2008
Posts: 7070
Location: south island New Zealand

PostPosted: Mon Jan 26, 2015 12:58 am    Post subject: Re: 7MM JDJ Reply with quote

so them its a rimmed 7mm/08?????

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PaulS
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Joined: Feb 18, 2006
Posts: 3418
Location: South-Eastern Washington - the State

PostPosted: Mon Jan 26, 2015 12:01 pm    Post subject: Re: 7MM JDJ Reply with quote

I'm of the mind that it is shortened, expanded with a 40 degree shoulder but my info may not be up to date or even correct.

A quick look at Ammo-one.com shows these JDJ 7mm rounds:

7mm JDJ, 7mm-30 JDJ, 7mm JDJ No.2, 280 JDJ

I know the original was based on the 256 Win., the 7mm-30 was based on the 30-30 and there is little information about the rest.

The JDJ line of 7mm cartridges was never very popular so reload data, manufactured cartridges, and information is all scarce.

I think Mr. Jones just like to try new things and while some of them were "unique" most were just different enough to call them wildcats.

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Paul
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Speer, Lyman, Hodgdon, Sierra, and Hornady = reliable loading data
So and So's pages on the internet = NOT reliable loading data
Always check data against manuals
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DrWatson
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Joined: Jun 11, 2015
Posts: 3

PostPosted: Thu Jun 11, 2015 4:35 pm    Post subject: Re: 7MM JDJ Reply with quote

hunterjoe21 wrote:
When I talked to my friend and aske about the parent case, he thought it was a .308 Win. I asked it might be stamped 307, which would actually make his barrel a 7 MM JDJ 2 (If I understood what I read online correctly).

Yes the parent case is the 307 [ rimmed 308]

I have 2 Barrels a 21 inch bull bbl rifle and a super 16 cut down to 15 and 7/8 with a custom muzzle break to make it just over 18
To be clear I can take the break off to make it a legal hunting pistol.[NY]

This is to allow them to be used for rifle and pistol hunting in NY I have one rifle action and one pistol action! [ Legal Federal Rules]

I reload this using the following loads

110 Grain Speer TNT bullets with 40 Gr of AA2460 It is very fast over 2800 in the 21 inch rifle and over 2600 in the 16 inch pistol.

120 Ballistic tip bullet with 42 Grains of AA2520 does well too.

I have loaded a few heaver bullets but I am a Velocity guy and they fell short of expectation.

At one time I was able to get 3000 fps with Barns 100 Gr bullets and Win 760 but when I told JD Jones he almost had a heart attack ! so I backed off that load. but it was not causing any pressure signs ?
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gelandangan
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Joined: May 07, 2006
Posts: 5757
Location: Sydney Australia

PostPosted: Thu Jun 11, 2015 5:07 pm    Post subject: Re: 7MM JDJ Reply with quote

Gday DrWatson.
Welcome to this site.

Thank you for your contribution to this thread.
It is always interesting to hear from others.

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Elvis
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Joined: Jul 27, 2008
Posts: 7070
Location: south island New Zealand

PostPosted: Thu Jun 11, 2015 5:23 pm    Post subject: Re: 7MM JDJ Reply with quote

indeed welcome Doc...... from where do you hail?????
there is another Dr Watson over here in N.Z. he is a long range guru of sorts...very talented fella.

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