PCP spring – twang, boing, sprong or maybe all three.

[TF89]

PCP spring – twang, boing, sprong or maybe all three.

My Benjamin Discovery is now so quiet that all I hear is the sound of the spring which reminds me of a detuned springer.  During the process of adding a Hill depinger and firing the gun until the air tank was empty I discovered the above mentioned spring and valve noise.  I get that without pressure, the hammer and valve spring bounce will be on the extreme side.

After filling the gun back up (for me that is 1650 shooting down to 1050 psi) I could still hear the noise.  Something else I discovered, when the rifle is next to my ear while quiet, it still has a bit of air and mechanical noise.  Very much the same affect as shooting a springer, not as loud of course.  Step back 20 feet and the only thing I can hear is the loud spring twang (not that it sounds like a twang more like a combination of the 3).

I’m assuming some of the noise is hammer bounce, just how much I don’t know.  Other parts are mechanical and there will always be some noise to be sure.  I have a Crosman 140 with a dump valve, now that gun is dead quiet, until pumping that is.  I want my cake and I want to eat it too.  

To get rid of hammer bounce options that I know of are:
1)   The SSG comes to mind.  My issue with the SSG is that it makes it hard to cock and in my gun, caused some galling in the air tube from the hammer, (other factors were in play which someday I plan on sharing).  My hammer now has the nylon buttons so galling shouldn’t be an issue.  That doesn’t change the cocking effort, it might help a little as the galling was adding to it.

2)   Travis has made the TSS, however not for the Discovery. 

What other factors are at play here, what have people done, looking for suggestions, etc. in reducing the twang?  Even if adding a debouncer, does that eliminate the twang?  I'm in uncharted waters on this.   If there have been postings about this, I'm unable to find much.

Thank you,

Dave