BARREL
MANUFACTURERS |
BARREL
CONTOURS |
SPECIAL CONTOURS |
CALIBER & RATE
OF TWIST
AVAILABLE CALIBERS
Shilen, Lilja and Hart are barrels we
use the most, however there are many other quality barrel
manufacturers.
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.
|
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
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
.204/20
.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
.270
7mm/.284
.307
.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
8mm/.323
.338
9mm/.355
.38/.357
.358
.375
10mm/.400
.411
.416
.44
.451
.458
|
|
* Stainless Steel Only |
|
| |
|
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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