Determining Twist Rate

Lately I have read a few comments here and there shooters not sure of the twist rate of their rifle. Heres some photos and a quick guide to check or confirm the twist rate of your barrel which is pretty vital information when it comes to choosing projectile weight.

 

 

Set the rifle in a rest and push a cleaning rod from the muzzle end with a cleaning brush or tight mop, if your fussy you can start at the breech end but its more fiddly.

 

 

 

 

 

 

Push the rod right through out the other side of the action and then draw it back into the barrel so the brush is past the chamber.

 

 

 

 

 

 

Stop there and wrap a piece of masking tape around the rod with the ends of the tape sticking straight up at 12 O’clock.

 

 

 

 

 

 

 

 

 

Continue to draw the rod out holding the barrel in your spare hand while the rod and tape rotates 360 degrees so once again the tape is at the 12 O’clock position, straight up.

Then measure the distance from the muzzle to the start of the tape, in this case its 16″ so this CZ has a 1 in 16 twist. Meaning the rifling rotates one full turn in a distance of 16 inches.

 

 

Coffs Harbour Branch Training Officer.