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Alternative 7.62 brass

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450 Fuller View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 450 Fuller Quote  Post ReplyReply Direct Link To This Post Posted: November 22 2022 at 2:58pm
I narrowed the cause of the pressure excursion soon after the event took place.
It was commercial .308 brass. The cause, as best determined, was a moderate loading of 4198 powder behind a 170 gr 30WCF FP bullet with gas check.Used many times with jacketed 150 gr bullets)
I had sworn off GC lead cast bullets in ALL bottle neck cases. In violating
the rule....these bullets were commercial over 20 years old so both the lube and
GC crimping were ancient. Member-never again club.

Years ago, a gunsmith explained to me his close calls with bottleneck cases and supposed "crimped" gas checks. If the GC separates and lands on the powder or is stuck in the cartridge neck, it is an obstacle...

Numrich offers a stripped Ishapore bolt head. While it may be a possible headspace question, Goosic is correct in that the bolt/bolt head was exposed to
excessive pressure. I am going to replace the bolt head. Reasonably priced.

I also think the Ishapore 2A1 Indian rifles with their steel history may rank below the 1898 Krag with one locking bolt, which would let go if pushed by
excess pressure.
Only the dead have seen the end of war-Plato

Socialism-The equal sharing of misery-Churchill

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britrifles View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote britrifles Quote  Post ReplyReply Direct Link To This Post Posted: November 22 2022 at 3:20pm
So, the base of the bullet was below the neck?   I can see that would cause the potential of the GC coming off.  

Seems to me that it’s possible the action body is yielded/distorted. 

It’s surely not just the bolt head that has yielded…


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Post Options Post Options   Thanks (0) Thanks(0)   Quote The Armourer Quote  Post ReplyReply Direct Link To This Post Posted: November 22 2022 at 3:59pm
Originally posted by 450 Fuller 450 Fuller wrote:

I narrowed the cause of the pressure excursion soon after the event took place.
It was commercial .308 brass. 

I also think the Ishapore 2A1 Indian rifles with their steel history may rank below the 1898 Krag with one locking bolt, which would let go if pushed by
excess pressure.


Had you considered that commercial 308 cases are very different specification to 7,62 NATO spec cases ?

Case wall thickness is much thicker on the 7.62 compared to 308
7.62 chambers are 13 thou (0.013") longer than 308 meaning that these thin-walled 308 cases stretch and can split.
The case volume on a 308 is greater than a 7,62 leading to different powder burning characteristics

Throw in a 'bit of extra powder' and you have an accident waiting to happen.

All the problems of stress that you have identified and all you are planning to do is 'replace the bolt head' because it's reasonably priced.

The rifle needs gas-axing. 

Some time in the future a member of your family may not know the rifles history, fire a slightly 'hot' round and end up with an explosion 6" in front of their face.

Buy a new rifle - it'll be a lot cheaper than the potential medical bills.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Shamu Quote  Post ReplyReply Direct Link To This Post Posted: November 22 2022 at 5:11pm
OK boys & Girls.
ENOUGH!
Let it go, please, or I'll be obliged to stop it for the welbeing of other less experienced forum users.
It was a serious over pressure event that effectively destroyed a rifle.
"It WENT KABOOM & we don't know why" is not a positive path to follow.
Don't shoot till you see the whites of their thighs. (Unofficial motto of the Royal Air Force)
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450 Fuller View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 450 Fuller Quote  Post ReplyReply Direct Link To This Post Posted: November 22 2022 at 5:38pm
All of these factors have been considered. 7.62 brass is stronger than commercial .308 indeed.
This $40 -original cost- rifle will be relegated to wall-hanger status.

Back to my Garands and pre-64 Model 70 Winchesters, which saw service in WWII
and Korea-Vietnam. Life is too short.
As a Vietnam combat veteran, and former Federal agent- I have had enough close calls for 3 people.
Only the dead have seen the end of war-Plato

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Shamu Quote  Post ReplyReply Direct Link To This Post Posted: November 23 2022 at 1:38pm
Good call. be safe & enjoy.
Don't shoot till you see the whites of their thighs. (Unofficial motto of the Royal Air Force)
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