N/A Schimel chrono >700fps?

[borne2fly]

I've always noted that my Schimel was unusually loud, so I finally got a chrono and measured it.
Using .22, 14.3gr pellets the chrono reported an average of around 720fps for the first dozen shots.
Fps dropped off rapidly after that (it only gets 15-16 shots per cylinder).

I'm not use to CO2 pistols delivering such high velocity.
Is this normal for Schimel?

 

[marflow 777]

if that is the case it is shooting at twice the normal FPS and which model was this with

 

[borne2fly]

Model P22

 

[borne2fly]

I also have a GP22, I will chrono that for comparison

 

[Felinis]

CO2 can fool a Chrono. The Chrono may detect the CO2 cloud and not the pellet.

 

[borne2fly]

CO2 can fool a Chrono. The Chrono may detect the CO2 cloud and not the pellet.

I was wondering about that. How far back do you need to be from the chrono?

 

[marflow 777]

the pistol should shoot 360fps, if you are using a screen style chronograph 3-4 feet ????

 

[borne2fly]

the pistol should shoot 360fps, if you are using a screen style chronograph 3-4 feet ????

Ahh, that’s the problem … I’m holding the muzzle only inches from it.

 

[borne2fly]

Ok, backed up several feet from the chrono.
First 12 shots started around 430fps and decreased to 400fps.
Next few shots dropped rapidly ... 388, 355, 325, 282.
This looks more believable.

Chrono is an Acetech AC5000, ..... pretty basic.
Don't know how accurate it is, but it measures around 420fps for my HW45 (.22) and that's about right.

 

[marflow 777]

you are back on track
if you don't have this it is good reading on the HW45
https://airgunwarriors.com/resources/library/Weihrauch_HW45_by_Todd_Cooper_Printable.pdf

 

[borne2fly]

you are back on track
if you don't have this it is good reading on the HW45
https://airgunwarriors.com/resources/library/Weihrauch_HW45_by_Todd_Cooper_Printable.pdf

Hmm, I get "403 Forbidden" for that link.
Guess I need to sign up for something to read it?

 

[Schwinnsta]

Ahh, that’s the problem … I’m holding the muzzle only inches from it.

The AC5000 has about 1 inch hole to shoot through. I doubt that end of the barrel should be very far. I think you doing it right but the results are wrong. I have no idea why.

 

[borne2fly]

The AC500 has about 1 inch hole to shoot through. I doubt that end of the barrel should be very far. I think you doing it right but the results are wrong. I have no idea why.

Yes, it's a small hole. I held the muzzle several feet back and was aiming very carefully not to hit the chrono. Fortunately I've had a lot of practice with the Schimel.

 

[Schwinnsta]

Yes, it's a small hole. I held the muzzle several feet back and was aiming very carefully not to hit the chrono. Fortunately I've had a lot of practice with the Schimel.

Yes, but I don't think that is the way it is meant to be used. I think you do put the muzzle up on the ledge of the hole or just an inch or two away. Mine seems to me giving the right readings.

 

[borne2fly]

Even for a CO2 gun?
I do that for the springers and the pump guns and it works as you say, but with my CO2 stuff it gives me some weird numbers

 

[Schwinnsta]

Even for a CO2 gun?
I do that for the springers and the pump guns and it works as you say, but with my CO2 stuff it gives me some weird numbers

I presently do not have any CO2 guns. I have one on back order, an Airbug. I don't why it would make a difference. I have seen videos of them being tested with CO2 guns.