Quick ? for those who have experienced regulator creep

Yes, that is one of the three-part series. Sorry to the OP, none of this answers your question about POI shift. I doubt that a little bit of creep on a properly tuned gun would affect horizontally or vertically for that matter. My unregulated BSA Buccaneer will see a shift diagonally about 3/8 of an inch between 230 bar and 140 bar at 30 yards and an ES of about 25 FPS. That is not much for such a wide range and I suspect that is caused by the expansion and contraction of the air tube pulling on the barrel band.

My examples are not referring to a non-regulated gun that one has now installed a regulator in. Of course if you choose to do this then you must tune it correctly and most likely modify some components and or open the transfer ports some. 

To say that a well tuned regulated PCP that has regulator creep issues will not show POI change or low velocity is just false. You cannot overcome valve-lock whether regulated or not. Now, when your reservoir pressure is below 200 bar, the velocity drops will probably be less than 30 fps but most regulated PCPs that are produced from the factory as regulated PCPs, fill to 250 bar plus and it will valve-lock on these higher fills when suffering regulator creep. To say you won't see POI change from a 25 to 30 fps spread is just not accurate either. You can detect it from as short as 35 yards and it will get more obvious as the distance grows. I know we all have different standards of accuracy but I can certainly see consecutive 5-shot groups walk around when shooting a PCP with a 30 fps bell-curve. Yes, the groups are tight but they walk around. 

I said a little bit of creep. Not a total failure. I was referring to a 5-10 bar increase which seems to be fairly common. I understand that a factory regulated gun will have a lot narrower pressure sweet spot than a unregged gun fitted with an after-market item. Of course, a major pressure increase will reduce the velocity until the valve locks. The question that was asked was will a creeping regulator cause a POI to shift sideways? I was not referring to or criticising your comments in any way.

We're good Eaglebeak. I'm not debating you but only trying to clarify what I'm referring to in my previous response in this post. It was said that if the regulated set up was tuned correctly then even if the regulator creeped it would have zero POI change or velocity change.

I agree that a 5-10 bar increase is minor and may not even need to be addressed. 

I said a little bit of creep. Not a total failure. I was referring to a 5-10 bar increase which seems to be fairly common. I understand that a factory regulated gun will have a lot narrower pressure sweet spot than a unregged gun fitted with an after-market item. Of course, a major pressure increase will reduce the velocity until the valve locks. The question that was asked was will a creeping regulator cause a POI to shift sideways? I was not referring to or criticising your comments in any way.

Click to expand...

Being were back to a part of OP's original inquire .... No, a minor change in pressure should not send a shot sideways in terms of the valve, regulator & firing cycle in general.



Barrel bands that contact barrel and secure to the air tube can get motion between them as pressures change ...

Barrels that are not real secure within receiver allow barrel to slightly shift around in general & this aggravated if barrel harmonics change ...

* As a note on shooter technique, most sideways / diagonal odd POI shifts are shooter created by having a heavy cheek weld and / or heavy hand pressure of trigger hand holding the gun. FYI