N/A Fx DRS 600 tricky

[LDNY ZLTN]

Hello
I have a brand new rifle , zero tunning.First time i've tried to set it on 175 m/s on 0,177 calibre.The speed was very inconsistent.I 've changed the plenum to a pellet plenum.Much better but far from good.I understand that the rifle will not work on that speed,and i try to set it to 16 J , maybe on a higher power will be more consistent. The chrony shows me 2-3 m/s deviation.Ok.I put the rifle in the case set on 16J ,next day the first 5-8 shots are 25-28 J .Two things was set by me.The regulator and the hammer spring . Why is the speed increasing with the smallest plenum?

 

[TMH]

It sounds to me like the regulator is creeping up, but not to the point where a high pressure causes valve lock (or the first several shots would be way LOW in power).

Did you assure that the gun AND plenum were fully de-gassed when making any regulator adjustments DOWN in pressure? If not you may have damaged the sealing surface on the regulator seat. ALSO - some DRS's seem to have bad regulators and valves (one of mine included in this) which FX replaced free under warranty. Another AGN user also recently posted that he had to replace both his valve and regulator under warranty.

(EDIT: On my DRS .22/600mm which had the reg & valve issue, the muzzle velocities were also very inconsistent - an extreme spread of 30-40 fps over 10 shots even when tossing out the first 2 shots (which can be typically low in DRS's). I had purchased this gun pre-owned though, and I have no idea how it was treated by its first owner.)

 

[SciueraPlumbea]

Maybe he's just off of the sweet spot for the pressure he's at. In fact i'd guarantee this can be remedied or mitigated greatly by fooling around with the HS tension

 

[Trucker3573]

Does sound like a reg pressure increase. I can only speak from my experience. I have never owned an amp reg that didn’t creep about 5 bar sometimes 7 when they sit. If you have temp fluctuations it is on the higher side. I have accepted it as is what it is. I have had a few when brand spanking new were pretty stable but rapidly went to increasing that 5-7 bar.

 

[LDNY ZLTN]

It sounds to me like the regulator is creeping up, but not to the point where a high pressure causes valve lock (or the first several shots would be way LOW in power).

Did you assure that the gun AND plenum were fully de-gassed when making any regulator adjustments DOWN in pressure? If not you may have damaged the sealing surface on the regulator seat. ALSO - some DRS's seem to have bad regulators and valves (one of mine included in this) which FX replaced free under warranty. Another AGN user also recently posted that he had to replace both his valve and regulator under warranty.

(EDIT: On my DRS .22/600mm which had the reg & valve issue, the muzzle velocities were also very inconsistent - an extreme spread of 30-40 fps over 10 shots even when tossing out the first 2 shots (which can be typically low in DRS's). I had purchased this gun pre-owned though, and I have no idea how it was treated by its first owner.)

No,it's not degassed . I put a digital gauge to set the reg.When i set the speed , i adjust the hammer spring and reg at the same time It was a bad idea?

 

[LDNY ZLTN]

Maybe he's just off of the sweet spot for the pressure he's at. In fact i'd guarantee this can be remedied or mitigated greatly by fooling around with the

It sounds to me like the regulator is creeping up, but not to the point where a high pressure causes valve lock (or the first several shots would be way LOW in power).

Did you assure that the gun AND plenum were fully de-gassed when making any regulator adjustments DOWN in pressure? If not you may have damaged the sealing surface on the regulator seat. ALSO - some DRS's seem to have bad regulators and valves (one of mine included in this) which FX replaced free under warranty. Another AGN user also recently posted that he had to replace both his valve and regulator under warranty.

(EDIT: On my DRS .22/600mm which had the reg & valve issue, the muzzle velocities were also very inconsistent - an extreme spread of 30-40 fps over 10 shots even when tossing out the first 2 shots (which can be typically low in DRS's). I had purchased this gun pre-owned though, and I have no idea how it was treated by its first owner.)

I'll buy a silencer to try it on 16 J how it works.If it works next level is to go to precision shooting

 

[Trucker3573]

No,it's not degassed . I put a digital gauge to set the reg.When i set the speed , i adjust the hammer spring and reg at the same time It was a bad idea?

Correct but is the digital gauge left on the gun all the time ? I bet if it is and you check after it sits the pressure in the plenum is a bit higher than where you set the reg at. This would account for a Cpl higher power shots after the gun has sat a bit.

 

[TMH]

No,it's not degassed . I put a digital gauge to set the reg.When i set the speed , i adjust the hammer spring and reg at the same time It was a bad idea?

Old habits die hard (for me). I have always been used to only increasing a regulator under pressure. And having to de-gas the gun & plenum space to decrease regulator pressure.

But it appears that you can adjust the new FX AMP regulator (which is in the DRS) in EITHER direction while the gun is pressurized. So if you followed what the manual says below then NO, what you did was not a bad idea. You may just have a sub-par regulator from the factory.

 

[Ries]

Dont decrease it while under pressure even if they advert this. Its a recipe for getting creep.

 

[LDNY ZLTN]

Correct but is the digital gauge left on the gun all the time ? I bet if it is and you check after it sits the pressure in the plenum is a bit higher than where you set the reg at. This would account for a Cpl higher power shots after the gun has sat a bit.

After i set the regu i shot a few dry shots.After that i am using the chrono .The plenums pressure get higher a little,2-5 bar. Now i am totally confused.

 

[LDNY ZLTN]

After i set the regu i shot a few dry shots.After that i am using the chrono .The plenums pressure get higher a little,2-5 bar. Now i am totally confused.i observe a thing.If i am waiting between shots a few minutes it is much better.But if i shot all the magazine one afther another maybe 6-7 shots are hole in hole , the others are going to side 4-5 cm on 20 meters

 

[TMH]

If the regulator is 'creeping' (kind of the same as leaking) it will allow higher pressure air from the over-the-barrel air cylinder into the plenum space. The regulator is the "gate-keeper" between the high pressure in the air cylinder and the set pressure you want in your plenum space. So reg creep would do what you say - the plenum pressure gets higher a little.

Regarding accuracy, what moderator/silencer (if any) are you using? The fact that the DRS has no shroud surrounding the barrel, means all of the air from the shot exits the muzzle with the pellet or slug. This can cause turbulence and/or clipping of the moderator. I find that with the DRS it is best to have a moderator which is at least 1 caliber larger than your barrel liner. And that moderator has to accomodate high air flow. I find the Silent Thunder Ordnance high flow Falx .30 cal moderators to work best - but you may not be able to purchase them where you live. I would at least be using a .25 cal moderator with your .177 cal gun.

 

[LDNY ZLTN]

If the regulator is 'creeping' (kind of the same as leaking) it will allow higher pressure air from the over-the-barrel air cylinder into the plenum space. The regulator is the "gate-keeper" between the high pressure in the air cylinder and the set pressure you want in your plenum space. So reg creep would do what you say - the plenum pressure gets higher a little.

Regarding accuracy, what moderator/silencer (if any) are you using? The fact that the DRS has no shroud surrounding the barrel, means all of the air from the shot exits the muzzle with the pellet or slug. This can cause turbulence and/or clipping of the moderator. I find that with the DRS it is best to have a moderator which is at least 1 caliber larger than your barrel liner. And that moderator has to accomodate high air flow. I find the Silent Thunder Ordnance high flow Falx .30 cal moderators to work best - but you may not be able to purchase them where you live. I would at least be using a .25 cal moderator with your .177 cal gun.

The guy from the shop show me the Donny Fly Sumo . He said this is good for DRS .He also said that moderator will help to shoot more accurate.Also i've called an old guy who is specialist in pcp rifles and he said to nkt try this rifle on that low energy (7,5 j) He told me that with my settings my speed will raise shot after shot.That is why i want to try it on 16 J after i'll buy a moderator.

 

[TMH]

DonnyFL Sumo should be a good choice. I would just suggest that you get it in .22 cal, or even in .25 cal to allow for the high volume of air flow out the muzzle of a DRS.

 

[SciueraPlumbea]

If the regulator is 'creeping' (kind of the same as leaking) it will allow higher pressure air from the over-the-barrel air cylinder into the plenum space. The regulator is the "gate-keeper" between the high pressure in the air cylinder and the set pressure you want in your plenum space. So reg creep would do what you say - the plenum pressure gets higher a little.

Regarding accuracy, what moderator/silencer (if any) are you using? The fact that the DRS has no shroud surrounding the barrel, means all of the air from the shot exits the muzzle with the pellet or slug. This can cause turbulence and/or clipping of the moderator. I find that with the DRS it is best to have a moderator which is at least 1 caliber larger than your barrel liner. And that moderator has to accomodate high air flow. I find the Silent Thunder Ordnance high flow Falx .30 cal moderators to work best - but you may not be able to purchase them where you live. I would at least be using a .25 cal moderator with your .177 cal gun.

Typically creep accounts for LOWER velocity shots for the first shots. I've done my time in fx land, and with several models. Replace with Huma reg, or get accustomed to typically lower first, maybe 2nd, rarely 3rd shots. It also helps to allow your Reg to fully Equalize after each shot cycle if you're chasing Ultra consistent velocity shot to shot. Every shot cycle you will your reg pressure drop sharply, then rise slowly and maybe bounce up or down a few C-hairs of a MM then after about 7-15secs finally settle. For a given pressure, Find the hammer setting where you're getting the lowest spread, THEN use the micro wheel to hunt until that spread narrows. DO NOT ride the peak of a given pressure or power wheel setting, It's always better to leave some room. You can mitigate that first shot (AFTER RESTING) velocity differential with hammer. IF somehow your velocity on first strike is higher, you're over tensioned and the string will also routinely bounce up and down. If you're set correctly on the hammer spring tension for the pressure youre operating at and the pressure creeps up You'll suffer lower velocity by a decent margin.