Heavy hammer spring

[mcc1961]

Will the heavy hammer spring for a Disco. 22 change the poi of the same pellets I was using on the original spring?

[MustangMike]

yup, because of more power behind the pellet... the heavy hammer spring in a disco is used to give the 18.1gr pellets the same velocity as the 15.9gr pellets

[Bryan21184]

I have been shooting my disco with the stock hammer spring. Should I get the heavy one be ause all I shoot is jsb 18.1 pellets because of their accuracy.

[rsterne]

If you install the heavy hammer spring and wish to take full advantage you will need to fill to 2400 psi.... ie the top of the yellow area on the pressure gauge.... While Crosman don't specifically say there is any safety problem doing that, the safety margin on the valve screws is reduced below 2:1.... so it's a decision only you can make....

Bob

[captwoody]

Bob are you still making those heavy springs i need one for my 25 disco project?

[rsterne]

I don't make them but I carry them in stock....

Bob

[captwoody]

Bob i sent you a pm for the spring and will be looking for your input once i get my double tube set up. only looking for 825 fps with a jsb king and i am already at 750.woody

[mcc1961]

How much extra power do you get from the heavy hammer spring in a .22 Disco with the 14.3 grain CPHP's? I have got some JSB's 18.1 grains coming and how many FPS do you get with a stock Disco with them?

[rsterne]

In conjunction with a 2400 psi fill, you get about 70-80 fps gain.... I got about 760-770 fps with 18.1s in a stock Disco.... so with the heavy hammer spring they should give about the same velocity as 14.3s in a stock gun.... ballpark....

Bob

[mcc1961]

How safe is it to fill the gun to higher pressure and where on the gauge do you fill it up to the green or yellow.

[rsterne]

Filling past 2000 psi reduces the safety margin on the valve mounting screws below 2:1.... If you want to read up on it, here is the appropriate thread....

http://www.gatewaytoairguns.org/GTA/index.php/topic,25091.0.html

The top of the yellow zone is about 2400 psi and that is where the heavy hammer springs work the best for maximum shot count.... If you only fill to 2000 psi you will simply get fewer shots as the peak of the velocity string is at about 1800 psi with 18 gr. pellets.... Filling to 2000 psi and refilling at 1500 will give you the ten best shots in the string.... 

Bob