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Old March 18, 2013, 09:38 AM   #1
salvadore
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6.5 grendel

A friend of mine is trying to turn 7.62x39 brass into 6.5 grendel brass. his new stuff needs to be fire formed but is unable to chamber anything we beleive because the necks need reamed. I've never done it, he's never done it and he's not sure how to proceed. Any help would be appreciated.
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Old March 18, 2013, 10:48 AM   #2
Jimro
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Hmm...

Should be, clean the brass, lube it up, run it through the full length resizer, trim, fireform. The 7.62x39 is longer, so if your friend didn't trim he might be jammed up against the chamber throat.

If your friend needs to trim I recommend a mandrel style outside the neck turning system.

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Old March 18, 2013, 09:37 PM   #3
salvadore
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jimro, he is using excessive force to seat bullets sometimes ruining necks because of it. He recently tried annealing the necks hoping seating would be easier. I'll ask about trimming, but don't think thats the problem. I'm thinking the necks need reamed.
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Old March 18, 2013, 10:53 PM   #4
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This is why it is always so helpful when the original poster gives us all the pertinent information in the first post. First it is a chambering issue now it is a seating issue.

Neck turning won't solve the problem of crushing shoulders if annealing didn't help. The expander ball in the resizer should ensure uniform seating force and neck tension, unless your friend is using a gelded resizing die. The seater die has no contact with the brass, so I doubt that is the problem....

By any chance is your friend using flat base bullets? And by any chance is your friend using the correct diameter, .264 bullets? Cause without a dial caliper at least your friend could be trying to jam a .277 caliber bullet where it wasn't meant to go if he also has a 6.8 SPC.

Can't really tell unless you have more information to help diagnose where the point of failure is. Resizing brass is not complicated, and crushing shoulders during seating sounds more like operator headspace and timing than needing to turn necks.

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Old March 19, 2013, 04:56 PM   #5
salvadore
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jimro, I said he was ruining necks, not crushing shoulders. This is why it's so important......
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Old March 19, 2013, 05:38 PM   #6
Jimro
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All right, so what is it, are the rounds unable to chamber as you originally wrote?

Quote:
A friend of mine is trying to turn 7.62x39 brass into 6.5 grendel brass. his new stuff needs to be fire formed but is unable to chamber anything we beleive because the necks need reamed. I've never done it, he's never done it and he's not sure how to proceed. Any help would be appreciated.
Or is it

Quote:
jimro, he is using excessive force to seat bullets sometimes ruining necks because of it. He recently tried annealing the necks hoping seating would be easier. I'll ask about trimming, but don't think thats the problem. I'm thinking the necks need reamed.
So a ruined neck is what exactly, describe it. Is is bulged? Is it cracked? What part of the resized brass won't chamber?

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Old March 20, 2013, 08:28 PM   #7
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Try doing a search for "reforming 7.62x39 to 6.5 Grendel" and you will find where others have figured out how to do this.
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Old March 20, 2013, 09:06 PM   #8
salvadore
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Thanks JAS, did this previously without much success, this time found a few things for him to check. Most of the advice from various sites was "buy factory brass." Duh. I have more brass in my basement than all the shooting stores in town, and this is Idaho with lotsa gun stores.
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Old March 21, 2013, 07:20 PM   #9
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The first hit on the Google search: http://www.65grendel.com/forum/showt...-7.62X39-Brass should be a jumping off point for more discussions on this topic within that forum.

Of course folks will advise using factory head-stamped brass. But there's also a bunch that for pride, frugality, or remote location who find the forming and fire-forming exercise rewarding.
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