7.62x39 123gr FP using H4895 for Subsonic Load?

[McGuiver]

7.62x39 123gr FP using H4895 for Subsonic Load?

Here is a sample bullet @ 190 grains with 1:10 twist barrel at 1050 feet per second. It shows it will stabilize just fine.





Again what weight are your bullets and what is your twist rate?

Don't discount your 1:10 twist rate for heavy projectiles...


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[Rottentofu]

That's what can happen when you use the wrong powder.
If you stick to reloading manuals, they have chosen the powders that would not do that.

I'm still new to reloading, but I am gonna assume the simulation doesn't qualify as reloading data.

[Rottentofu]

Here is a sample bullet @ 190 grains with 1:10 twist barrel at 1050 feet per second. It shows it will stabilize just fine.





Again what weight are your bullets and what is your twist rate?

Don't discount your 1:10 twist rate for heavy projectiles...


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Thank you for the data. Mine is a Yugo SKS with 123gr FP bullets.

[ar15barrels]

I'm still new to reloading, but I am gonna assume the simulation doesn't qualify as reloading data.

Correct.
The simulation does not take the chances of detonation into effect.
If you read the manuals (not just for the data), you would know the basic safety stuff about why a powder charge should fill a case as much as possible.
The simulation shows the case fill percentage for that reason.
No safe/sane reloader would choose a powder with such low case fill and burn percentages.

Don't be cheap when safety is at risk.
Go buy the right powder.

[Rottentofu]

Correct.
The simulation does not take the chances of detonation into effect.
If you read the manuals (not just for the data), you would know the basic safety stuff about why a powder charge should fill a case as much as possible.
The simulation shows the case fill percentage for that reason.
No safe/sane reloader would choose a powder with such low case fill and burn percentages.

Don't be cheap when safety is at risk.
Go buy the right powder.

Understood and will do. Thank you.

Edit: Forgot to ask, I also reload 300blk subsonic and I notice most subsonic loads do not fill the case. Those loads are deemed safe to shoot. Is there a reason why those partially filled loads are safe to shoot? I reload 300blk subsonics with only 8-9gr of H110 and that's according to H110 reloading data.

[McGuiver]

7.62x39 123gr FP using H4895 for Subsonic Load?

Understood and will do. Thank you.

Edit: Forgot to ask, I also reload 300blk subsonic and I notice most subsonic loads do not fill the case. Those loads are deemed safe to shoot. Is there a reason why those partially filled loads are safe to shoot? I reload 300blk subsonics with only 8-9gr of H110 and that's according to H110 reloading data.

Most of my sub-sonics for 300 AAC also don't fill the case, but the bullet is seated very deep. The bullet fills up the remaining space. I recommend not using H110 in subsonic AK rounds. Use something like A1680, CFE-BLK, IMR-4198 or IMR-4227 powder. Less likely to detonate your rifle. H110 powder does not like being put in a case partially full, it likes almost full cases.

Here are some other links to help you on your sub-sonic adventure. Do this at your own risk.

http://www.theakforum.net/forums/19-ammunition-reloading/238569-subsonic-7-62x39-loads-development.html#/topics/238569

http://www.theakforum.net/forums/19-ammunition-reloading/237945-thoughts-heavy-bullet-7-62x39.html#/topics/237945

http://castboolits.gunloads.com/showthread.php?315886-7-62x39-Subsonic

http://www.uzitalk.com/forums/showthread.php?77368-Searching-for-published-7.62x39-subsonic-load-data-that-will-cycle-an-AK

http://www.sniperforums.com/forum/cartridges-calibers/32358-7-62x39-subsonic.html#/topics/32358

https://nebraskafirearms.org/forum/index.php?topic=14181.0

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[Rottentofu]

Most of my sub-sonics for 300 AAC also don't fill the case, but the bullet is seated very deep. The bullet fills up the remaining space. I recommend not using H110 in subsonic AK rounds. Use something like A1680, CFE-BLK, IMR-4198 or IMR-4227 powder. Less likely to detonate your rifle. H110 powder does not like being put in a case partially full, it likes almost full cases.

Here are some other links to help you on your sub-sonic adventure. Do this at your own risk.

http://www.theakforum.net/forums/19-ammunition-reloading/238569-subsonic-7-62x39-loads-development.html#/topics/238569

http://www.theakforum.net/forums/19-ammunition-reloading/237945-thoughts-heavy-bullet-7-62x39.html#/topics/237945

http://castboolits.gunloads.com/showthread.php?315886-7-62x39-Subsonic

http://www.uzitalk.com/forums/showthread.php?77368-Searching-for-published-7.62x39-subsonic-load-data-that-will-cycle-an-AK

http://www.sniperforums.com/forum/cartridges-calibers/32358-7-62x39-subsonic.html#/topics/32358

https://nebraskafirearms.org/forum/index.php?topic=14181.0

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Thank you for the info.

[McGuiver]

Thank you for the info.

Just be careful. If you want sub-sonics, use a faster powder. IMR-4227 or the like. My goto powder for sub-sonic rounds is CFE-BLK for 7.62x39 and 300 AAC.


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[rm1911]

I only have H4895 so I can only work with what I have. Thank you for the data.