Accuracy great-until the pistol’s psi gauge dropped to 70bar. Normal?

[HajjitheDoberman]

I shoot Bullseye with a Pardini SP-22 Olympic pistol, decided to try a Pardini K-12 for Air Pistol Bullseye 10-Meter practice in my garage.
After a few hundred pellets downrange, the air cylinder dropped from 200bar to 70bar. Pellet impact went from X-ring to below the black, several inches drop. The group went from the size of a dime to looking like a shotgun pattern.
I assume that the pistol meters a specific amount of air for each shot, and at a certain pressure, it is unable to maintain the set pressure, resulting in erratic accuracy.
The Pardini operating manual, in addition to being written in 4 or 5 languages, has minimal useful info. I will ask PardiniUSA what the pressure is regulated for, but wondered if others have the same loss of accuracy as the cylinder’s pressure drops below a certain point?
Thanks for your responses!

 

[rsfrid]

Sounds normal to me. Don't wait so long before refilling with air.

 

[RickH]

Sounds about right. I have a target rifle pcp that’s fine for 60 rounds normally and groups tightly if I’m doing my job properly. After that, zero drops quickly and group size gets awful.

Rick H.

 

[weevil]

If you’re gonna shoot ‘em, you should at least learn the basics of how they work, if only for safety purposes and to avoid damaging the valve, which can happen when the pressure gets too low. Here’s a nice introductory article. Part of a series if you’re inclined to learn more…

HAM Airgun Technical - How PCP Airguns Work

In his first first article for HAM, our new Technical Editor Bob Sterne writes about how PCP airguns work, and how they fit into the family of airguns. Welcome Bob and take it away…

hardairmagazine.com

 

[maxtrouble]

Keep your pistol in the green to avoid a POI change. I get 200 shots with my LP400 and then refill to avoid any change in POI from a 200 bar fill.

 

[Star7]

I do not own the pardini but it sounds like you got about the right number of shots before it went off the regulator. I have Walther LP500, FWB P8X and a Tau 8.....all do about that before needing topping up. A match is 60 shots plus sighters....

 

[HajjitheDoberman]

If you’re gonna shoot ‘em, you should at least learn the basics of how they work, if only for safety purposes and to avoid damaging the valve, which can happen when the pressure gets too low. Here’s a nice introductory article. Part of a series if you’re inclined to learn more…

HAM Airgun Technical - How PCP Airguns Work

In his first first article for HAM, our new Technical Editor Bob Sterne writes about how PCP airguns work, and how they fit into the family of airguns. Welcome Bob and take it away…

hardairmagazine.com

Thanks
First I have seen anything about HAM magazine. Looks informative and interesting.

 

[Helmet]

I don't know the K-12 personally, but an average 10m air pistol will deliver in the ball area of 200 shots from a full cylinder. And most 10m air pistols fall off the regulator somewhere between 80 and 70 bars. So your K-12s behavior is as expected.