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#202801 - 10/21/19 01:41 PM Re: 358 JDJ Rounds Will Not Chamber [Re: JDK]
98Redline
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Registered: 10/10/10
Posts: 709
Loc: Eastern PA

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You could also use Cerrosafe to do a quick chamber cast to measure exactly what the chamber looks like.

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#202809 - 10/21/19 05:28 PM Re: 358 JDJ Rounds Will Not Chamber [Re: JDK]
Mech 8
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Registered: 08/30/11
Posts: 236
Loc: San Antonio, TX

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What brand/headstamp of brass are you using? I believe all of the original measurements were set up using R-P brass. If the neck thickness of your brass is more than that of the R-P 444 Marlin brass, I would say that is the issue.

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#202810 - 10/21/19 06:43 PM Re: 358 JDJ Rounds Will Not Chamber [Re: Mech 8]
JDK
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Registered: 01/18/04
Posts: 363
Loc: Texas Hill Country

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I'm using Starline. If you get a chance, could you measure the outside neck of a loaded round? If you have calipers or a micrometer, that might solve the mystery. It would also suck since a lot of people believed that Starline's production would keep us all in parent brass for a long time. Thanks.
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But for the grace of God, there, I go.

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#202826 - 10/21/19 09:28 PM Re: 358 JDJ Rounds Will Not Chamber [Re: JDK]
magman
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Registered: 01/18/04
Posts: 825
Loc: NY

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I'd just give SSK a call in the AM.
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#202831 - 10/21/19 10:11 PM Re: 358 JDJ Rounds Will Not Chamber [Re: magman]
junebug
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Registered: 10/26/09
Posts: 2408
Loc: Bardstown ,Ky

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My fired Rem. case measures .386.5 -.387, a sized case measures .378. With a .358 bullet seated it measures .381 -381.5 . So you seem to have a tight neck. I only have Rem. brass to measure.
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#202839 - 10/22/19 06:35 AM Re: 358 JDJ Rounds Will Not Chamber [Re: junebug]
Mech 8
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Registered: 08/30/11
Posts: 236
Loc: San Antonio, TX

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My loaded rounds measure .380 with RP brass and Hornady 200gr SP bullets seated.

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#202844 - 10/22/19 08:05 AM Re: 358 JDJ Rounds Will Not Chamber [Re: Mech 8]
JDK
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Registered: 01/18/04
Posts: 363
Loc: Texas Hill Country

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Thanks a bunch guys! Yeah, it does seem like the neck is cut too tight. No doubt the Starline brass appears a hair thicker than Rem., but Junebug?s fired cases would not fit in my chamber either. I?ll call SSK this morning and ask them about it. I sent an email Sunday night, but haven?t heard back yet. I think Doc said JD was hunting and he maybe the one who answers that email account. Thanks again for the help!
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John

But for the grace of God, there, I go.

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#202850 - 10/22/19 11:11 AM Re: 358 JDJ Rounds Will Not Chamber [Re: JDK]
JDK
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Registered: 01/18/04
Posts: 363
Loc: Texas Hill Country

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I spoke to Brian at SSK and he said their reamer is good and it is not the chamber. He suspects the Starline brass and said it works with 375 JDJ, but will NOT work with 309 JDJ. He said they haven't tried it with 358 JDJ yet, so I might be in uncharted waters. He said I could send it back, but that'll cost me $20 for postage. I'm trying to see if I can get a loaded round from someone local to me to check. If it works in one SSK cut chamber, but not mine, then I know it's the chamber. Conversely, It could show pretty quickly that Starline Brass is not going to work for JDJ cartridges below .375, which can help others save time and money by not making the mistake I made. Thanks for all the info gents!
_________________________
John

But for the grace of God, there, I go.

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#202858 - 10/22/19 12:49 PM Re: 358 JDJ Rounds Will Not Chamber [Re: JDK]
billa
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Registered: 02/12/05
Posts: 881
Loc: Central PA

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Sorry I joined the party late. My loaded rounds - with Hornady brass - measure .385. A fired case measures .386. I suggest pulling a bullet and pressing the expanded case into the chamber to see if it fits. I am guessing it is very close. If it?s less than .001 you could possibly find slightly smaller bullets for fire forming. Once fired brass may thin out enough to work in the future. You could also have newly formed brass neck turned on a trimmer tool or a lathe. My chamber was cut by SSK in 1981 and has seen a lot of action.
_________________________
"Therefore go and make disciples of all nations,... "
Matthew 28:19

Handgun hunter since 1979 - haven't used a rifle since!
HHI member #992, NRA, SCI.

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#202859 - 10/22/19 12:50 PM Re: 358 JDJ Rounds Will Not Chamber [Re: billa]
billa
old hand


Registered: 02/12/05
Posts: 881
Loc: Central PA

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I assume you are not crimping. I do not crimp.
_________________________
"Therefore go and make disciples of all nations,... "
Matthew 28:19

Handgun hunter since 1979 - haven't used a rifle since!
HHI member #992, NRA, SCI.

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