.22 Disco fps or fpe?

[mcc1961]

What is the max fps or fpe you are getting from your Disco in .22?

[Airgun.Sniper]

Im not sure if your asking if stock or not. Rdsail will prolly chime in here. Ive seen some get 32fpe not stock. Ive tested one in .22 cal and had a little over 20fpe

 Jay

[Rdsail]

I got 40fpe on mine but i think I could have gone higher with that. But I was only getting 5 shots. I  would say I could have gotten it to 45 with heavier pellets I was shotting with JSB 18.1.

But I recommend to keep it around 30-33. The shot count found it around 10-15. I found that accuracy suffers past 33 fpe.

[mcc1961]

I have the Boss Disco valve, heavier hammer, heavy hammer spring and the Disco Double tubes.With the CPHP's I get a little 29 fpe and get around 17 shots.

[Rdsail]

MCC,

You gun is shooting very inefficiently. I wast getting 13-14 shots at 33 fpe with only the stock tube. you might want to open up your tport and barrel port for better flow.

[mcc1961]

How about using the poly tubing , would this help any?How many shots should I get?

[Rdsail]

The poly tubing should work. But you need to check your the size of your valves exhaust and the barrel port. You don't do anything by enlarging your tport when the Barrel port is still small.

[mcc1961]

Is the exhaust port still stock size with a boss valve?

[Rdsail]

I have no idea. I have never seen a boss valve. I only use modified stock valves

[mcc1961]

What all have you done to your rifle to get it to where it is now?

[1377x]

i have a stainless steel 2260 that is shooting over 50fpe for 7-8 shots
its not a disco but the disco can do the same thing. i am filling to 300psi and have a heavily modified disco valve and rear cocking hammer. i would think a disco would get a few more shots with the extra volume
i do have a .25 disco that is shooting over 70fpe 7 shots with 3 follow ups

[mcc1961]

Thats pretty impressive 1377 and Rdsail, how do you go about getting all the power out of your guns?

[rsterne]

Stock Disco is about 22-23 FPE in .22 cal, less in .177 cal.... With a hammer spring change and some mild porting work you can increase that to the 30 FPE area.... With significant changes you can get about 50 FPE with heavy pellets for 8-10 shots, and then to make the gun useful and accurate, detune it to about 36-37 FPE using JSB Heavies at 950 fps getting about 14ish shots.... IMO that is the practical maximum in .22 cal....

In .25 cal, an otherwise stock Disco will shoot about 28-30 FPE with JSB Kings, but using the same mods as for a 50 FPE rifle in .22 cal you can hit nearly 60 FPE for 7-8 shots.... That can be detuned to a nice 9-10 shot string at just over 50 FPE with the Kings, which is the practical maximum in .25 cal.... If you want to throw away half the Disco parts and stary building custom bits, including beefing everything up to run 3000 psi, over 100 FPE is possible shooting 50-53 gr. bullets, but only about 5 shots per fill....

Getting "all that power" out of a Disco is a matter of a lot of work, and unless you know what you're doing, modding a PCP is a bit daunting and can quickly become unsafe....

Bob