Rifle twist
- Thread starter bobby18
- Start date
Twist rate is to do with stabilising the bullet. Heavy bullet slow twist will not stabilise - poor accuracy.
You are the other way - light bullet fast twist. The risk you run is that for the 40's you may overspin them (so this is speed dependent) - and this can pull the jacket off the bullet in flight. I would say it is not ideal, but at 223 speeds you can but try. The 55 should be fine
You are the other way - light bullet fast twist. The risk you run is that for the 40's you may overspin them (so this is speed dependent) - and this can pull the jacket off the bullet in flight. I would say it is not ideal, but at 223 speeds you can but try. The 55 should be fine
Will be fine and you should with this faster twist you are able to shoot longer bullets better . 1-8 is not a big problem as regards spinning the bullet too fast with lead varmint bullets.
@tackb they are not 'heads' they are bullets.
The head holds the primer and has an identifying headstamp on it.
As @Eric the Red says it's length not weight that creates instability and needs a faster spin than a shorter bullet.
@bobby18 a 1:8 twist barrel will be fine for the 'cica' 45 / 55gr bullets and will also stabilise non-lead bullets in that weight range.
Here is a link to a calculator that will allow you to determine if the bullet you choose will stabilise.
What is the Miller twist rate formula?
The Miller twist rate formula is a calculation that is used for predicting Specific Gravity (SG) for modern long range bullets.
bergerbullets.com
HonestJohn
Well-Known Member
You’ll probably find the heavy end of those will perform better. But good news is that it will shoot copper bullets 
tackb
Well-Known Member
@tackb they are not 'heads' they are bullets.
The head holds the primer and has an identifying headstamp on it.
As @Eric the Red says it's length not weight that creates instability and needs a faster spin than a shorter bullet.
@bobby18 a 1:8 twist barrel will be fine for the 'cica' 45 / 55gr bullets and will also stabilise non-lead bullets in that weight range.
Here is a link to a calculator that will allow you to determine if the bullet you choose will stabilise.
What is the Miller twist rate formula?
The Miller twist rate formula is a calculation that is used for predicting Specific Gravity (SG) for modern long range bullets.
i will forever call them heads as long as it winds up pedants like you , especially as it sits in the neck
HonestJohn
Well-Known Member
There are petrolheads, metalheads, and d1ckheads, but no bulletheads
What happened to your reply on the .223 heads question@tackb they are not 'heads' they are bullets.
The head holds the primer and has an identifying headstamp on it.
As @Eric the Red says it's length not weight that creates instability and needs a faster spin than a shorter bullet.
@bobby18 a 1:8 twist barrel will be fine for the 'cica' 45 / 55gr bullets and will also stabilise non-lead bullets in that weight range.
Here is a link to a calculator that will allow you to determine if the bullet you choose will stabilise.
What is the Miller twist rate formula?
The Miller twist rate formula is a calculation that is used for predicting Specific Gravity (SG) for modern long range bullets.
It doesn't 'wind me up' at all, nor does it curry you any favour, although I do like your enthusiasm.
... 'perfectly well' - is that a a term of accuracy ?
The .222 Special was designed to fire a range of projectiles with the 55gr being the most suitable (and common) to meet the US Army requirements to penetrate a standard US steel helmet @ 500yds.
In the early 60's this chambering was adopted and became the .223REM (5.56x45 NATO) and is still used today in the US M4 rifle and the UK's SA80.
There are some slight/technical differences in the chambering/cases but they are, in the world we are in, the same.
Wikipedia is your friend .. .223 Remington - Wikipedia
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