Twist rate question

[dkmlever]

I own a weatherby 300 that has a 1 in 12 twist rate. Which Nosler bullets and what speed do you think would work the best when I reload?

 

[6ppcar]

The 1-12 twist will stabilize all bullets up to and including the 180 gr.
The 180gr would be my choice .

 

[Antelope_Sniper]

6pp +1

 

[flashhole]

Are you sure the twist is 1:12? A 300 will usually have a 1:10 twist as the cartridge is well suited for longer heavy bullets. With a 1:10 twist you can go all the way to 220 grain bullets.

 

[baltz526]

here is a list of standard twist rates

Common Rifle Barrel Twist Rates

By Chuck Hawks



For a more comprehensive list that covers many more calibers see the "Expanded Rifle Barrel Twist List" on the Tables, Charts and Lists Page.

Rifle barrels are designed to incorporate lands and grooves that spin the projectiles they fire so that they will fly true and hit point-on. That is the fundamental definition of a rifle, it uses a rifled barrel. Rifle barrels are grooved so that the bullet makes one complete turn in a given number of inches on its trip down the barrel.

There seems to be an inordinate interest in twist rates these days. With very few exceptions the major manufacturers have carefully and correctly researched the subject and experimented to determine the most appropriate twist rate for each caliber. There is very little to be gained by second guessing their conclusion.

What follows is a list of the rates of twist for common rifle cartridges. These were taken from various sources. The rates of twist below are expressed as "one complete turn in so many inches" (i.e. 1 in 9", 1 in 10", etc.).



.17 HMR = 1 in 9"
.22 Long Rifle = 1 in 16"
.222 Remington = 1 in 14"
.223 Remington = 1 in 12"
.22-250 Remington = 1 in 14"
.223 WSSM = 1 in 12"
.243 Winchester = 1 in 10"
6mm Remington = 1 in 9"
.243 WSSM = 1 in 10"
.240 Wby. Mag. = 1 in 10"
.25-06 Remington = 1 in 10"
.257 Wby. Mag. = 1 in 10"
6.5x55 Swedish Mauser = 1 in 7.5"
.260 Remington = 1 in 9"
.264 Win. Mag. = 1 in 9"
.270 Winchester = 1 in 10"
.270 WSM = 1 in 10"
.270 Wby. Mag. = 1 in 10"
7x57 Mauser = 1 in 9"
7mm-08 Remington = 1 in 9.25"
.280 Remington = 1 in 9.25"
7mm Rem. SAUM = 1 in 9.25"
7mm WSM = 1 in 9.5"
7mm Rem. Mag. = 1 in 9.25"
7mm Wby. Mag. = 1 in 10"
.30 Carbine = 1 in 16"
.30-30 Winchester = 1 in 12"
.300 Savage = 1 in 10"
.308 Winchester = 1 in 12"
.30-06 Springfield = 1 in 10"
.300 Rem. SAUM = 1 in 10"
.300 WSM = 1 in 10"
.300 Win. Mag. = 1 in 10"
.300 Wby. Mag. = 1 in 10"
7.62x39 Soviet = 1 in 7.5"
.303 British = 1 in 10"
.32 Win. Spec. = 1 in 16"
8x57 JS Mauser = 1 in 9.25"
.338-57 O'Connor = 1 in 10"
.338 Win. Mag. = 1 in 10"
.340 Wby. Mag. = 1 in 10"
.357 Mag. = 1 in 16"
.35 Remington = 1 in 16"
.35 Whelen = 1 in 16"
.350 Rem. Mag. = 1 in 16"
.375 H&H Mag. = 1 in 12"
.378 Wby. Mag. = 1 in 12"
.416 Rem. Mag. = 1 in 14"
.416 Wby. Mag. = 1 in 14"
.44 Rem. Mag. = 1 in 20"
.444 Marlin = 1 in 20"
.45-70 Govt. (Marlin and Ruger rifles) = 1 in 20"
.450 Marlin = 1 in 20"
.458 Win. Mag. = 1 in 14"
.460 Wby. Mag. = 1 in 16"

 

[baltz526]

BUT, it lists a 7mm rem mag has a 9.25". i'm sure most are, but i had a barrel that came on a interarms markX with a 1-11" it shot 120gr ballistic tips very well and 140gr also. you can measure your twist, simply by jaging a patch in your barrel and marking a start point and and end point of one complete twist, then measuring the distance between the marks. do it several times and get an average. this will be a very close number to what your barrel is.

 

[baltz526]

accurite reloading lists the 300 weatherby with a 1 12" twist

 

[Guest]

You may also find that factory mass-produced rifles frequently have wide tolerance on the twist. If you're factory literature says 1:10, you may have 1:9.5, or 1:10.5, or maybe more or less. Best way to find out what your gun shoots is to try something middle of the road first, determine good accuracy for the gun, and then experiment. As long as you can get them to shoot at distances you'll likely shoot and hit the target pointy end first, don't worry about the twist.

 

[baltz526]

then i found this

308 Norma Magnum - 1 in 10" .Musketeer; Schultz & Larsen308 Norma Magnum - 1 in 12" .Browning; Husqvarna30-338 - 1 in 10" . . . . . . . . . . . . .Remington 40-XB300 Winchester Mag. - 1 in 10" .Browning BAR Mark II, A-Bolt II; FN; Harrington& Richardson 300; Musketeer; Remington 700,40-XB; Savage 110, 112, 114, 116; Sako;Winchester 70, 670, 770; Ruger 1,77; MagnumResearch Mountain Eagle; Wichita; WeatherbyMark V, Vanguard (new); Thompson/CenterRifle300 Winchester Magnum - 1 in 12" Husqvarna300 Weatherby Mag. - 1 in 9 1/2" .Weatherby Mark V (current)300 Weatherby Mag. - 1 in 10" .Weatherby Vanguard (current); Sako;Winchester 70; Remington 700300 Weatherby Mag. - 1 in 12" .Weatherby (old); Remington 700 (current)300 RUM - 1 in 10" . . . . . . . . . .Remington 700; Savage30-378 Weatherby – 1 in 10" . . .Weatherby Mark V300 Dakota - 1 in 10" . . . . . . . . .Dakota Arms

 

[baltz526]

well i learned something, my vangard 300 win mag has a 1 12" barrel and a deep throat

 

[dkmlever]

Yes, I measured the twist at 1 in 12 as this rifle is a 1961 German Weatherby, the early ones had this twist, Weatherby changed to 1 in 10 in the late 60is.

 

[6ppcar]

Yes, I measured the twist at 1 in 12 as this rifle is a 1961 German Weatherby, the early ones had this twist, Weatherby changed to 1 in 10 in the late 60is.

Correct, the early Weatherbys had 1 in 12 twist and were very accurate.