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BARREL MANUFACTURERS  |  BARREL CONTOURS  |  SPECIAL CONTOURS  |  CALIBER & RATE OF TWIST
AVAILABLE CALIBERS
 

Barrel Manufacturers

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Shilen, Lilja and Hart are barrels we use the most, however there are many other quality barrel manufacturers. 

Barrel Contours

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The information below will give you an idea of the size and weight of every Shilen barrel contour. Dimension "C" is the muzzle diameter at dimension "F", which is our suggested finish barrel length.

barrelcon.GIF (3687 bytes)

Dimensions (inches)

 

Contour #

A

B

C

D

E

F

G

Weight at G Length

1 Featherweight

1.200

.700

.550

2.5

6

20

22

2 lbs. 10oz.

2 Lightweight

1.200

.765

.575

2.5

6

24

26

3 lbs.
3 oz..

3 Sporter

1.200

.815

.625

2.5

6

24

26

3 lbs.
7 oz.

4 Magnum Sporter

1.200

.860

.650

3.0

6

26

28

3 lbs.
14 oz.

5 Lightweight Varmint

1.200

.910

.700

3.0

6

26

28

4 lbs.
8 oz.

5-1/2 Medium Weight Varmint

1.200

.960

.750

3.0

6

26

28

4 lbs.
14 oz.

6 Lightweight Target*

1.250

--

.750

3.0

--

26

28

6 lbs.

7 Standard Varmint

1.250

--

.890

4.0

--

26

28

7 lbs.
1 oz.

8 Heavy Bull Barrel

1.200

--

1.000

3.0

--

26

28

7 lbs.
12 oz.

9 Rimfire Target*

1.125

--

.825

4.0

--

26

28

5 lbs.
12 oz.

Benchrest Special

Straight cylinder, 30" long, any diameter from 1.300" to 1.450", 29" maximum finish length

 

Straight Barrel

Any diameter up to 1.230" 29" maximum finish length

 

* Straight taper
** Straight taper in special contour for Varmint Class of benchrest competition

Caliber & Rate of Twist

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The information below will help you select the best barrel twist for your specific needs, providing of course there are multiple choices. If you’ll be shooting one bullet weight, choose a twist from the chart just fast enough to stabilize it. Too fast a twist simply overspins the bullet and may result in reduced accuracy. On the other hand, a twist too slow for any bullet will likely produce instability, keyholing and rotten accuracy. So if you’re going to be using several bullet weights, be sure to select a twist that will stabilize the heaviest one, since lighter bullets will also be stabilized.

By way of explanation, the numbers in the "Twist" column indicate how far the bullet must travel through the bore to make one full revolution. This is determined by the rate of rotation of the rifling. For example, a 9"-twist barrel spins the bullet one full turn when it passes 9 inches through the bore. In a 16"-twist barrel, the bullet makes one revolution in 16 inches. So at the same bullet velocity, the 9" twist is faster (spins the bullet faster) than the 16" twist. Consequently, as the chart reflects in the .224 CF section, the 9" twist is necessary for stabilizing heavier bullet weights.

Again looking at the .224 CF section, if you’re planning to shoot 55-grain bullets, the 14" twist is ideal. This twist is also the best choice for 52- and 53-grain match bullets driven at moderate velocities. But if you’re also contemplating shooting a 60-grainer, go with the 12" twist, since it will stabilize all the bullets you’ll be using. As you can see from the 15" and 16" twists, higher velocities also spin the bullet faster and may enable a slower-than-recommended twist to stabilize a marginally overweight bullet. However, this is tricky stuff best left to those who are highly experienced in operating at the ragged edge of stability and sanity.

The basic principles just outlined apply to all the calibers below. But, if you have questions or need a recommendation, let us know.

.172

  •    9" For bullets heavier than 30 gr.

  •   10" For bullets up to 30 gr.

.204/20

  •   12" For all bullets.

.222 RF

  •     14"* Twist for pistol barrels

  •     16" Standard twist for rifle barrels

  •     17"* Special twist for rifle barrels

.224 CF

  •     8" For bullets heavier than 70 gr.

  •     9" For bullets up to 70 gr.

  •     12" For bullets up to 63 gr.

  •     14" For bullets up to 55 gr.

  •     15"* For bullets up to 55 gr. driven 4,100 fps or more

  •     16"* For bullets up to 55 gr. driven 4,300 fps or more

 6mm/.243

  •    8"  Special for VLD bullets over 100 gr.

  •    10" For bullets up to 120 gr. and VLD under 100 gr.

  •    12" For bullets up to 85 gr.

  •    13"* For bullets up to 75 gr.

  •    14"* For bullets up to 70 gr.

  •    15"* Special for bullets up to 70 gr.

.257

  •     9"  For bullets heavier than 100 gr.

  •     10"  For bullets up to 100 gr.

  •     12"  For bullets up to 90 gr.

  •     13"* For bullets up to 80 gr.

  •     14"* For bullets up to 70 gr.

 6.5mm/.264

  •     8"  For bullets heavier than 130 gr.

  •     9"  For bullets up to 130 gr.

 .270

  •     10" For all bullets

 7mm/.284

  •     9" For bullets heavier than 140 gr.

  •     11" For bullets up to 140 gr.

 .307

  •     13"* Special size and twist

 .308

  •     8" For bullets heavier than 220gr.

  •     10" For bullets up to 220 gr.

  •     12" For bullets up to 170 gr.

  •     14"* For bullets up to 168 gr.

  •     15"* For bullets up to 150 gr.

7.65mm/.311

  •     10" For all bullets

 8mm/.323

  •     10" For all bullets

 .338

  •     10" For all bullets

 9mm/.355

  •     14" For low-velocity wadcutters

  •     16" For all other bullets

 .38/.357

  •     14" For low-velocity wadcutters

  •     18" For all other bullets

 .358

  •     14" For all bullets

 .375

  •     12" For all bullets

 10mm/.400

  •     16" For all bullets

 .411

  •     14" For all bullets

 .416

  •     14" For all bullets

 .44

  •     20" For all bullets

  •     16" For low velocity wadcutters

 .451

  •     16" For all bullets

 .458

  •     14" For all bullets

 

* Stainless Steel Only

 
   
Available Calibers

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If the caliber you want is not listed, please contact us.

Print the Available Calibers

Available Calibers

.17 HMR 7 X 57 Ackley
.17 HMR Match .280 REM
.17 HM2 .280 Ackley
.17 CCM  7mm SAUM
.17 REM  7mm WSM
.204 Ruger  7mm REM MAG
22 LR (Most chamber dimensions)  7mm WBY
.22 MAG  7mm STW
.22 PPC  7mm RUM
.22 BR .300 SAVAGE
.222 REM .300 Ackley
.222 Ackley .308 WIN
.223 REM .308 Ackley
.223 Ackley .30-06
.22-250 REM .30-06 Ackley
.22-250 Ackley .300 H&H MAG
.220 SWIFT .308 NORMA
.220 Ackley .300 REM SAUM
.223 WSSM .300 WSM
.243 WIN .300 WIN MAG
.243 Ackley .300 WBY
 6mm REM .300 RUM
.240 WBY Mag .300/378 WBY MAG
 6 BR  8mm REM MAG
 6 PPC  8 X 57 JS
.243 WSSM  8 X 57 Ackley
.250 SAVAGE .338-308
.250 Ackley .338-308 Ackley
.257 ROBERTS .338-06
.257 Ackley .338-06 Ackley
.250 SUPER .338 WIN MAG
.250 Ackley .338 Lapua
.25-06 REM .338 RUM
.25-06 Ackley .338-378 WBY
.257 WBY Mag .340 WBY MAG
 6.5-06 Swedish Mauser .35 WHELEN
6.5-06 Ackley .35 Ackley
 6.5 X 55 Swedish Mauser .358 NORMA MAG
6.5 X 55 Ackley .358 STA
 6.5 X 257 .358 WIN
6.5 X 257 Ackley .375 H&H MAG
.260 REM .375 Ackley
.264 WIN MAG .375 RUM
6.8 REM SPC .378 WBY MAG
.270 WIN .416 REM MAG
.270 Ackley .416 Rigby
.270 WSM .450 MARLIN
.270 WBY .458 WIN MAG
 7mm-08 REM .458 LOTT
7mm-08 Ackley .460 WBY MAG
7 X 57 MAUSER  

 

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