MontanaRifleman
Well-Known Member
Mud, what is your application... hunting? Target shooting?
Need some rifle twist experts to help me out...
- Thread starter MudRunner2005
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MudRunner2005
Well-Known Member
Initially, load development and targets while getting the wildcat tamed...And loads developed.
Then LR coyote & varmint hunting (750-1000 yards)...Maybe even LR whitetail deer.
With that bullet, and traveling 4200 fps, it shows my drop out to 1000 (with a 100 yard zero) will be 125.92" (just a hair shy of 13 MOA)...And it will still be retaining 2,329.6 fps velocity, and 1,084.4 ft. lbs of energy...Which will be more than alot of LR calibers with much larger bullets (such as .308 Win, etc...), so it might even be a very viable option for LR hunting large or fast animals such as deer, antelope, or anything of that nature...
If I can only reach 4,000 fps, it will still only drop 143.20", will retain 2,158.8 fps velocity, and 931.2 ft. lbs of energy...Which is still ****-impressive for a .224 caliber bullet.
Have you even looked at a stability factor calculator?
http://www.bergerbullets.com/litz/TwistRuleAlt.php
You really want 1.4 factor minimum. At 4000fps a 7.7 twist is fine. You'd probably get away with 8 twist, so long as 4,000 fps is your minimum. A bullet only gets more stable as it travels downrange, also, but you need that stability factor at the muzzle.
http://www.bergerbullets.com/litz/TwistRuleAlt.php
You really want 1.4 factor minimum. At 4000fps a 7.7 twist is fine. You'd probably get away with 8 twist, so long as 4,000 fps is your minimum. A bullet only gets more stable as it travels downrange, also, but you need that stability factor at the muzzle.
MudRunner2005
Well-Known Member
Yes, I have used those plenty of times before...
How do they get more stable downrange? Most bullets will reach a point where they loose so much velocity they begin to tumble...
MontanaRifleman
Well-Known Member
Unfortunately you won't be able to get those bullets close to 4000 fps before they come apart. Best chance at getting a thin skinned bullet out of a tight twist at high velocity is with a 5R gain twist bore. The best thing for you to
do is call the bullet maker to find the top end velocity of their offerings. Your other option is to call Dan at CEB and see what the heaviest highest BC bullet he can make you in a.224 7 twist. I'm guessing maybe an 80.
The barrel makers are sure gonna like you
do is call the bullet maker to find the top end velocity of their offerings. Your other option is to call Dan at CEB and see what the heaviest highest BC bullet he can make you in a.224 7 twist. I'm guessing maybe an 80.The barrel makers are sure gonna like you
HARPERC
Well-Known Member
Again no experience just an interested observer. My "guess" is a heavy/long .224 bullet, driven to 4000fps +, in a 1:7" twist barrel, will need to be monometal of some sort to keep the back end from catching up to the front end, and have minimal bearing surface..
There are some threads from Kirby Allen's efforts with .224 heavyweights that are good reads.
The TTH site has some good discussions about the subject.
Ken Clark did get Hornady to make a run of bullets, but mostly he made his own bullets. I think to be successful, making the bullets yourself will still be required.
There are some threads from Kirby Allen's efforts with .224 heavyweights that are good reads.
The TTH site has some good discussions about the subject.
Ken Clark did get Hornady to make a run of bullets, but mostly he made his own bullets. I think to be successful, making the bullets yourself will still be required.
I'm speaking of spin stability only. Dynamic stability is a different animal
MontanaRifleman
Well-Known Member
Most bullets will stabilize fine with an Sg of 1.1. For hunting applications you typically want a 1.4 or better.
HARPERC
Well-Known Member
The best thing for you to
The barrel makers are sure gonna like you
Missed this. Any Idea what a minimum run might be? GS custom home page indicates they will make custom bullets.
Definitely want enough taper to set it back 2-3x.
MontanaRifleman
Well-Known Member
I'm guessing a min run would be 50, not sure. Best thing to do is call and find out
If it hasn't changed, it is 250. But that isn't for a totally new bullet. That is a tweak on an existing one.
HARPERC
Well-Known Member
Thanks!
MontanaRifleman
Well-Known Member
Gerard Schultz
Well-Known Member
The minimum quantity for a totally new bullet is the quantity for one box. Could be 25, 50 or, for something smaller than .243 it would be 100. That applies only after we have established that the bullet is exactly what is required.
I need some basic information to get started but it usually does not take more than one or two prototypes to arrive at the solution needed. Prototypes do not cost anything apart from transport/postage. Bullet design is still done in South Africa and if we have a rifle available, initial testing is done in SA as well but manufacturing is now done in the USA
I need some basic information to get started but it usually does not take more than one or two prototypes to arrive at the solution needed. Prototypes do not cost anything apart from transport/postage. Bullet design is still done in South Africa and if we have a rifle available, initial testing is done in SA as well but manufacturing is now done in the USA
