Can Someone Explain Rifling

warrenb

warrenb

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I thought I had little a bit of an idea about rifling but then I was looking at the stevens model 200. Why would the 223 and 22-250 have such differing rate of twist. Theres not that much variation in the their bullets as far as I know.


From the savage web site model 200 barrel rate of twist:
1 in 9" (223 REM)
1 in 9.25" (243 WIN)
1 in 9.5" (7MM-08 REM)
1 in 10" (308 WIN)
1 in 12" (22-250 REM)

thanks.
 
optimal twist rates change not only with the weight of the bullets used, but thier speed as well.

not to mention bullet design (think about all the new VLD's)
 
factory ammo choices. You dont see too many factory loads for the '250 over 60 gr. while the 223 has some match ammo available in 69 gr loads.

many other manufacturers put a 1-12 twist in there 223's, but the 1-9 has been a wise choice for savage, as it attracts a portion of the long range crowd.


The higher velocity of the 22-250 compared to the 223 means it doesn't need as fast a twist to stabilize the bullet
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this is a false statement, try a 75 gr a-max in a 1-12 twist 22-250 and tell me what shape your bullet hole is. If anything, the higher velocity might cause it to come unbalanced quicker. Think of a tire that is out of balance, does your car vibrate worse at 80 km/h or 110 km/h. Similar principal.
 
I've wondered about that too. I concluded that the slow twist on 22-250 was because most people wanted it for varmints and used lighter bullets in it. The .223 on the other hand is basically modeled on the military 5.56 which has mostly switched up to heavier bullets that need a faster twist to stabilize them. In my .223 I'm using mostly 69 gr that wouldn't stabilize properly with a 1 in 12 twist.
 
220Swifty said:
factory ammo choices. You dont see too many factory loads for the '250 over 60 gr. while the 223 has some match ammo available in 69 gr loads.

many other manufacturers put a 1-12 twist in there 223's, but the 1-9 has been a wise choice for savage, as it attracts a portion of the long range crowd.
Click to expand...

That makes sense. It was the fact that that some of the remington 223s
are 1-12 twist and some of the 22-250 are 1-14 that got me into this confusion. Again!
 
warrenb said:
That makes sense. It was the fact that that some of the remington 223s
are 1-12 twist and some of the 22-250 are 1-14 that got me into this confusion. Again!
Click to expand...
You want confusion? ..... Consider the 35cals that come in 1:12", 1:14" and 1:16".



.
 
So then what are the downfalls of twisting it too fast? Resistance to the movement and higher pressure? Shearing off the jacket as it pushes through a twisted cheese grater?

I'm trying to wrap my head around rifling for .458" 350gr - 480gr bullets right now, so no cells left for tiny bullets. Please explain :)
 
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BUSHMAN79 said:
The faster a bullet spins, the harder it is for a demon to climb on and steer it off course.
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Reading between the lines, I think what your saying is that you never can tell how the rifling is gonna effect any given bullet in any given barrel. That this is the reason why reloading and careful experimentation without regard for cost or time is necessary. Right?
 
Quote:
Originally Posted by BUSHMAN79
The faster a bullet spins, the harder it is for a demon to climb on and steer it off course.

Reading between the lines, I think what your saying is that you never can tell how the rifling is gonna effect any given bullet in any given barrel. That this is the reason why reloading and careful experimentation without regard for cost or time is necessary. Right?
Click to expand...

No, rifling does actually throw weaker demons off of bullets and makes the rest too dizzy to interfere with bullet flight. You can hear them scream in frustration when they fall off during richocetts. Longer bullets have more seating room for demons, therefore must be spun faster.
Bullets also kill by letting light inside animals. Not everyone knows that.
 
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unstableryan said:
So then what are the downfalls of twisting it too fast? Resistance to the movement and higher pressure? Shearing off the jacket as it pushes through a twisted cheese grater?

I'm trying to wrap my head around rifling for .458" 350gr - 480gr bullets right now, so no cells left for tiny bullets. Please explain :)
Click to expand...


bullets spinning tooo fast can tear them selves apart in a lead poof, and they turn to dust :eek:
 
Dogleg said:
No, rifling does actually throw weaker demons off of bullets and makes the rest too dizzy to interfere with bullet flight. You can hear them scream in frustration when they fall off during richocetts. Longer bullets have more seating room for demons, therefore must be spun faster.
Bullets also kill by letting light inside animals. Not everyone knows that.
Click to expand...

That's good Mike, I enjoyed that.
 
I was told by my Guru a few years ago to join GunNutz because it held the last bastions of firearm sanity.

God Bless.
 
Update to Original Question - Serious

Sorry I'm back on this trip.

When examining the effects of rifling should we take into account the total bullet length or just the area that touches the rifling?


For example. Sierra 60 grn HPs are 0.74 in length and Nosler 55 grn Bal tips are 0.834. The BTs are longer but I think from the shape there may be more percentage area of the HPs that touch the rifling.

thanks guys.
 
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