Recoil indicator test

[Robbo]

Ideally when resting a pellet on a flat surface on the top of the gun, when fired with a pellet chambered the pellet on top should move forward slightly. What does it mean if it goes backwards and how can I fix it. Cheers.

 

[Neil54]

Have you measured power with heavy and then light pellets?

 

[Robbo]

Nope, the backward movement of the pellet was with baracuda 15.

 

[Ste Hughes]

What gun is it?

 

[Robbo]

Hw80k

 

[Robbo]

Recoil feels a little harsh, quite a twang from the spring, chronoing at high 11s. I know a little movement of the pellet forward is good, but what does backwards movement mean?

 

[P8X]

Ideally when resting a pellet on a flat surface on the top of the gun, when fired with a pellet chambered the pellet on top should move forward slightly. What does it mean if it goes backwards and how can I fix it. Cheers.

You have bounce.
Caused by the high start pressure of the heavy pellet.
Try a lighter pellet
7.87g if .177
13.43 if .22

 

[Robbo]

If it still bounces with a lighter pellet should I change or do something with the original spring?

 

[shergar]

If spring is the thicker wire, 23 mm OD, then preload will be minimal to keep gun legal below 12 fpe.
Could try a short stroke or use a 20.4 OD spring with 3.1 mm wire.