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All Springer/NP/PCP Air Gun Discussion General > Engineering- Research & Development

Hammer Bounce

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rsterne:
Bullet weights in both calibers (I am interested in any difference in SD)?.... Pressures?....

Bob

sixshootertexan:
NOE Molds
.308 135 BBT
.308 155 BBT
.257 100 BBT

sixshootertexan:
Do you think an SSG will help?

rsterne:
Providing you can get enough hammer strike to open the valve, most definitely an SSG should get rid of the hammer bounce.... I would try for 3-5 lbs. of preload and about 1/16"-1/8" of gap between the valve stem and hammer face when uncocked, that is ideal.... You can get away with more gap, but over 1/4" and you may see slight difference in velocity shooting uphill or downhill.... It's a matter of balancing spring rate, preload, and gap....

Bob

sixshootertexan:
Ok so 4 1/2 lbs compressed my spring .270". I preloaded the spring .200" and I have .160" of free travel on the hammer. I'll get the rifle together and test as soon as I can.

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