Hmmm, shorter for subsonic? That's a fly in the ointment.
Maybe we'll have to look at increasing the mass of subsonic round by using a different bullet profile and composition. Let's say standard copper jacketed, long, streamlined bullets for supersonic and round nosed, cast lead for sub sonic. We need the subsonic rounds to be as heavy as possible...
Bullet stabilisation
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All handloading data posted on Full-Bore UK from 23/2/2021 must reference the published pressure tested data it was sourced from, posts without such verification will be removed.
Any existing data without such a reference should be treated as suspect and not used.
Use reloading information posted here at your own risk. This forum (http://www.full-bore.co.uk) is not responsible for any property damage or personal injury as a consequence of using reloading data posted here, the information is individual members findings and observations only. Always verify the load data and be absolutely sure your firearm can handle the load, especially older ones. If in doubt start low and work your way up.
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meles meles
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Re: Bullet stabilisation
Badger
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Sandgroper
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Re: Bullet stabilisation
Why as heavy as possible?meles meles wrote:Hmmm, shorter for subsonic? That's a fly in the ointment.
Maybe we'll have to look at increasing the mass of subsonic round by using a different bullet profile and composition. Let's say standard copper jacketed, long, streamlined bullets for supersonic and round nosed, cast lead for sub sonic. We need the subsonic rounds to be as heavy as possible...
Why not use one bullet and just vary the load? I used 168 gn A-Max bullets (7.62) for both subsonic and normal loads.
I've attached an excel spreadsheet for determining twist rate - ballistic tipped bullets throw the results a bit, but it'll give you rough idea.
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- twistrate.xls
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Lieutenant General David Morrison
I plink, therefore I shoot.
Lieutenant General David Morrison
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meles meles
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Re: Bullet stabilisation
Sandgroper wrote:
Why as heavy as possible?
The slow bullets will be very susceptible to wind, hence the heavier they are the bigger the p**f needed to knock them off course...
Badger
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Badger Korporashun
Quidquid latine dictum sit altum viditur.
"Quelle style, so British"
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"Quelle style, so British"
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Sandgroper
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Re: Bullet stabilisation
Depending the bullet you might not need 'as heavy as possible' to counter the wind, but I've only tinkered with subsonics and don't know all the ins and outs.meles meles wrote:Sandgroper wrote:
Why as heavy as possible?
The slow bullets will be very susceptible to wind, hence the heavier they are the bigger the p**f needed to knock them off course...
“The standard you walk past is the standard you accept.”
Lieutenant General David Morrison
I plink, therefore I shoot.
Lieutenant General David Morrison
I plink, therefore I shoot.
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tackb
Re: Bullet stabilisation
I use 168 Amax supersonic and a 180g flat base round nose for subsonic , both shoot well ?
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meles meles
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Re: Bullet stabilisation
Sandgroper wrote:
Depending the bullet you might not need 'as heavy as possible' to counter the wind, but I've only tinkered with subsonics and don't know all the ins and outs.
We'll let Gallileo and Newton debate the intricacies of mass if they must in the horizontal and vertical planes, and Descartes can try resolving it for them. In practice, a heavy bullet is best for minimising wind drift and won't hit the ground sooner than a light one...
Badger
CEO (Chief Excavatin' Officer)
Badger Korporashun
Quidquid latine dictum sit altum viditur.
"Quelle style, so British"
CEO (Chief Excavatin' Officer)
Badger Korporashun
Quidquid latine dictum sit altum viditur.
"Quelle style, so British"
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Sandgroper
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Re: Bullet stabilisation
:cool2:meles meles wrote:Sandgroper wrote:
Depending the bullet you might not need 'as heavy as possible' to counter the wind, but I've only tinkered with subsonics and don't know all the ins and outs.
We'll let Gallileo and Newton debate the intricacies of mass if they must in the horizontal and vertical planes, and Descartes can try resolving it for them. In practice, a heavy bullet is best for minimising wind drift and won't hit the ground sooner than a light one...
“The standard you walk past is the standard you accept.”
Lieutenant General David Morrison
I plink, therefore I shoot.
Lieutenant General David Morrison
I plink, therefore I shoot.
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meles meles
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Re: Bullet stabilisation
Aspirin sales always go up in our vicinity...
Badger
CEO (Chief Excavatin' Officer)
Badger Korporashun
Quidquid latine dictum sit altum viditur.
"Quelle style, so British"
CEO (Chief Excavatin' Officer)
Badger Korporashun
Quidquid latine dictum sit altum viditur.
"Quelle style, so British"
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Sandgroper
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Re: Bullet stabilisation
Maybe if you didn't try to be a such a smartar*e it wouldn't happen.meles meles wrote:Aspirin sales always go up in our vicinity...
“The standard you walk past is the standard you accept.”
Lieutenant General David Morrison
I plink, therefore I shoot.
Lieutenant General David Morrison
I plink, therefore I shoot.
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John25
Re: Bullet stabilisation
The mathematics is easy.
The son of the squaw on the hide of the hippopotomus is equal to the sons of the squaws on the other two hides.
The son of the squaw on the hide of the hippopotomus is equal to the sons of the squaws on the other two hides.
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