Barrel length and twist question

[Danny Butler]

Personally I think you are shorting yourself with the 150 in that caliber. The rifle twist is 1/10 from the factory. 1/10 is usually for 168 and heavier bullets. I wouldn't shoot anything lighter than a 180...I've hooked up hogs with my .300 win out to 948 yards with the 180.

 

[FEENIX]

You are correct Feenix, but the actual weight has noting to do with the it, it is the length of the bullet.

That is why most shooter talk about twist rate being relative to bullet weight. Conventional bullets get longer as they get heavier.

If you made a long bullet with a lighter core material, it would still need the faster twist.

I know I am picking fly poop out of pepper, but when I am looking at twist rate, I am looking at bullet length options, not weight.

JMHO

When you increase the weight, you increase the length, that is why it is part of the equation in Berger's twist rate calculator as montanarifleman noted. You can look at it as the length of the bullet but the weight is still a factor . In other words, both weight and length are factors in the twist rate to properly stabilize the bullet (SG).

 

[MontanaRifleman]

When you increase the weight, you increase the length, that is why it is part of the equation in Berger's twist rate calculator as montanarifleman noted. You can look at it as the length of the bullet but the weight is still a factor . In other words, both weight and length are factors in the twist rate to properly stabilize the bullet (SG).

Actually, if you increase or decrease the weight without changing the length you will have to change the twist to maintain the same SG (stability factor)

 

[DavidleeCole]

I have an older model 300wby vanguard that I've customized and wanting to get a new barrel soon. The load I've worked up and am use to is 150grain Nosler Accubond that travels in the realm of 3,400fps. I've been doing a lot of research and reading other posts in here, but only find recommendations for larger bullets. I'm wanting to go with 26-28" barrel, but clueless as to what twist. Can you guys school me on the differences in twist and barrel length please? Your help and advice is greatly appreciated!

I have an older model 300wby vanguard that I've customized and wanting to get a new barrel soon. The load I've worked up and am use to is 150grain Nosler Accubond that travels in the realm of 3,400fps. I've been doing a lot of research and reading other posts in here, but only find recommendations for larger bullets. I'm wanting to go with 26-28" barrel, but clueless as to what twist. Can you guys school me on the differences in twist and barrel length please? Your help and advice is greatly appreciated!

I have the same gun and I put an lilja mark 13 on it 28" stock in cut and finished out at 28.75" its 1:10 twist 6 grove shoots great with 210 nos accbound LR with 80.6 gr of RL26 @3080ish. But the action is metric thread tell the gunsmith SK he will know before hand mine found that out and it cost me a lil extra for the time to set up the lathe and equipment. You will live the barrel

 

[just country]

morning, run barnes bullets. cause of there construction a shooter
can do a lot with the 165-168gr. TTSX, TSX and LRX bullets.
I favor longer barrels #5-6 contour. added velocity is
favored in the magnum calibers. twist is to ur liking.
justme gbot tum

 

[pcmacd]

I have an older model 300wby vanguard that I've customized and wanting to get a new barrel soon. The load I've worked up and am use to is 150grain Nosler Accubond that travels in the realm of 3,400fps. I've been doing a lot of research and reading other posts in here, but only find recommendations for larger bullets. I'm wanting to go with 26-28" barrel, but clueless as to what twist. Can you guys school me on the differences in twist and barrel length please? Your help and advice is greatly appreciated!

What is your current twist? Not hard to figure with a wire brush and ball bearing handled cleaning rod. If it is working for you why not stay with that?

If you plan to stay with 150 gr, an 11 or 12 would be ok, but you can't go wrong with a 10 twist, which is likely what you have now.

I'd give the guys at Sierra a call; they won't care if you are using Nosler components.

 

[FEENIX]

Actually, if you increase or decrease the weight without changing the length you will have to change the twist to maintain the same SG (stability factor)

Any changes in the bullet parameters will affect the others, i.e., if you change the weight you also change the BC, and thus affecting the SG.

 

[MontanaRifleman]

Any of changes in the bullet parameters will affect the others, i.e., if you change the weight you also change the BC, and thus affecting the SG.

Yup

 

[Gerard Schultz]

Do not equate stable flight with correct terminal ballistics. To hunt with long bullets over long distances requires a long magazine box and a tight twist. Under 500 the twist does not matter if it is tighter than 1:10" but over 500 it does matter. I would go with a 9" twist and 26" barrel.

 

[L.Sherm]

Do not equate stable flight with correct terminal ballistics. To hunt with long bullets over long distances requires a long magazine box and a tight twist. Under 500 the twist does not matter if it is tighter than 1:10" but over 500 it does matter. I would go with a 9" twist and 26" barrel.

Why would the O.P go anything faster than a 1-10 shooting 150 grain bullets or even if he went up to 215. Anything faster going 3400 hes just gonna take a chance of seeing dreaded " poof" with 150's.

 

[Gerard Schultz]

That is only true if you use jacketed lead bullets. With copper monos it does not happen and you get the best of both worlds: Very close to the BC of the heavier bullet but the speed of the lighter bullet. Given that BC is a combination of form factor and speed, copper monos translate into very much the same wind drift as a jacketed lead bullets but much flatter trajectory and sometimes a shorter time of flight.

Under 500 a 1:9" twist will not hurt anything and over 500 he can use bullets as long as he likes, a 300 Weatherby will not work up the speed to disintegrate bullets but he will get correct terminal performance on animals.

For one load to work, we will need to know how far the average shot is and what type of shooting is done: target/tactical or hunting.

 

[L.Sherm]

150grain Nosler Accubond

 

[Gerard Schultz]

And I said: "Under 500 a 1:9" twist will not hurt anything and over 500 he can use bullets as long as he likes, a 300 Weatherby will not work up the speed to disintegrate bullets but he will get correct terminal performance on animals.

For one load to work, we will need to know how far the average shot is and what type of shooting is done: target/tactical or hunting."

 

[L.Sherm]

Yardage has nothing to do with how many rpms the bullet leaves the barrel.