I've been chasing a slow leak in my P35-25. Yesterday I replaced the 3 O-rings in what I call the front end, the part before the regulator. A day or two earlier I replaced the O-rings behind the regulator. Still seems to leak about 50 bar a day. I was thinking of degassing it again but decided to shoot it some to see if the pellet preferences are still the same and to have a little fun with it. I learned some interesting things about the tune.
This gun has an Extreme Airguns added volume plenum and slightly larger ports and passage between the ports. I have tuned it to a little over 50 fpe a couple times but I took out the shim on the hammer spring yesterday which decreased hammer force a little. I'm wondering if the leak might be from the poppet and have a ballon on the end of the barrel right now to check that theory.
When I started shooting I was about 230 bar. Limit is 250 for these guns. First 5 shots with the MKII heavies it likes were about 750 fps with the first spot a little lower at 727. I'd turn the spring up a little if I could. I also measured the sound of three of these shots with a phone app and got 80.3db, 83.7 db, and 78.2 db. I then shot some cast pellets (still shoot poorly), FX 25.4s (shot pretty well at about 850 fps), SPA 25.93 (poor at about 835), H&N FTTS (20 grain, 925 and very inaccurate, curiously these were pretty accurate before I added the plenum), and a lot more MKIIs and original Heavies. After 38 shots I was down to 145 bar. The next half dozen were almost all over 750 fps and the magazine after that averaged about 770 fps. The peak I got was 790 fps. That was two shots before I looked at the gauge again and it read 110 bar. The velocity fell to 734 after a few more shots. The gauge read 100 bar.
So I have about 38 shots, I think, on the regulator with a 230 fill. Probably 40 with a full fill to 250 bar. To me that is OK for ~45 fpe. But the interesting thing is the 20 shots after that. They are if anything a few fpe more powerful than the first 40. ES goes up including them in the string from about 18 to about 41 fps. But that is OK for plinking or even hunting. I was shooting a 30 yard challenge target as I did this and the POI didn't change much. It was too windy to be precise about the POI and I was also using its normal 4-14X scope so I wasn't set up to see small changes in POI.
60 shots at around 45 fpe is a lot for a little gun with a 450mm barrel. You could even argue I should fill it to ~140 bar for hunting and take advantage of the slightly higher fpe once it is effectively unregulated. I don't think I've ever used 20 shots in a day hunting with a rifle. If I hand pumped still I would also like being able to get some useful shots and only fill to this relatively low level. I plan to fill it up close to 250 bar still but if I pull it out of storage and see a pressure under 150 bar it's nice to know it's still usable.
This gun has an Extreme Airguns added volume plenum and slightly larger ports and passage between the ports. I have tuned it to a little over 50 fpe a couple times but I took out the shim on the hammer spring yesterday which decreased hammer force a little. I'm wondering if the leak might be from the poppet and have a ballon on the end of the barrel right now to check that theory.
When I started shooting I was about 230 bar. Limit is 250 for these guns. First 5 shots with the MKII heavies it likes were about 750 fps with the first spot a little lower at 727. I'd turn the spring up a little if I could. I also measured the sound of three of these shots with a phone app and got 80.3db, 83.7 db, and 78.2 db. I then shot some cast pellets (still shoot poorly), FX 25.4s (shot pretty well at about 850 fps), SPA 25.93 (poor at about 835), H&N FTTS (20 grain, 925 and very inaccurate, curiously these were pretty accurate before I added the plenum), and a lot more MKIIs and original Heavies. After 38 shots I was down to 145 bar. The next half dozen were almost all over 750 fps and the magazine after that averaged about 770 fps. The peak I got was 790 fps. That was two shots before I looked at the gauge again and it read 110 bar. The velocity fell to 734 after a few more shots. The gauge read 100 bar.
So I have about 38 shots, I think, on the regulator with a 230 fill. Probably 40 with a full fill to 250 bar. To me that is OK for ~45 fpe. But the interesting thing is the 20 shots after that. They are if anything a few fpe more powerful than the first 40. ES goes up including them in the string from about 18 to about 41 fps. But that is OK for plinking or even hunting. I was shooting a 30 yard challenge target as I did this and the POI didn't change much. It was too windy to be precise about the POI and I was also using its normal 4-14X scope so I wasn't set up to see small changes in POI.
60 shots at around 45 fpe is a lot for a little gun with a 450mm barrel. You could even argue I should fill it to ~140 bar for hunting and take advantage of the slightly higher fpe once it is effectively unregulated. I don't think I've ever used 20 shots in a day hunting with a rifle. If I hand pumped still I would also like being able to get some useful shots and only fill to this relatively low level. I plan to fill it up close to 250 bar still but if I pull it out of storage and see a pressure under 150 bar it's nice to know it's still usable.