Twist

[landymick]

Anybody know of an air rifle barrel with a twist of less than 1 in 16.I read once that less twist is more accurate at long range above 50 yds.Cheers chaps

[Theobenrules]

The sinner rifle has a barrel with a 1-14 twist. I believe its made by lothar walther

[draconis]

Air arms ev2 mk4 and new FTP900 = 1 in 14

[100MeterCrew]

The sinner rifle has a barrel with a 1-14 twist. I believe its made by lothar walther

The 22LR Lothar Walther barrels used in the Drummen Sinner all have a twist of 416 mm which equals to a twist of 1-16,38

[landymick]

Anybody found any notable difference in accuracy at long range with 1-14 as oppose to 1-16,i'm thinking even slower twist rate.I should have been clearer by saying spin speed e.g. 1-20 is less than(slower) 1-16.That is one revolution in 20 as oppose to one in 16.Hope this is understandable,non FAC also only normal air rifle pellets.

[draconis]

Projectile weight, size, speed, and also barrel length and altitude all have a bearing on the optimum twist rate for barrels.
for an 8.4grain, .177 @ 784fps the closest optimum twist rate is 1 in 14 with a 17 inch barrel, and that'll be good from sea level upto 10.000 foot.

for the closest you are looking for, please see my previous post

[XTX]

TX200 1:17",
HW97 1:15.5" ,
Rapid Mk 1 1:14",
Steyr 110ft 1:17" ,
HW100 1:16",
CZ (S200) 1:18.5",
BSA 1:18.5",
Steyr barley twist 1:15.5"
HW50 1:16"
(these are all measured from my own rifles/barrels apart from the Steyr barley twist, you may find that your barrel is different, it seems manufacturers change the barrels/twist rate from time to time)
Officially the LW barrels (which are fitted to a lot of different rifles) are 1:450mm (1:17.71"), this includes the polygonal barrels.

I have been told that slow twist rates (1:20+) would be best for accuracy but I have also been told that a faster twist rate is better in the wind. This is for sub 12ftlbs.