Do I need warm up shots before chrony on pumpers?

[Sh00ter]

I am beginning my data acquisition journey on my airgun collection and starting with my stock Crosman 1377. I did two 5-shot groups and the second group was a ~5fps higher avg than the 1st group. It got me thinking, if I am going to do chrony runs, do I need to warm up the gun with a few shots before I begin to record the data? I was trying several pellets types/weights in an evening and some groups were in immediate sequence (pump still warm) and some were with a beer rest between moving to the next pellet. I just want to be sure I am gathering things in a consistent-enough manner to judge the gun's performance for potential hunting.

Is there a standard way of conducting chrony testing with pumpers? Also, of course if a warm barrel matters, I'd be curious to see what the process should be for any type of air gun.

Thanks!

[Back_Roads]

 If setting your gun up for target shooting than a warm gun would be best, but if you just pump up and shoot a critter now and then, I would run the cold numbers and pace the shots.

[Nvreloader]

Since you mentioned hunting, as your bases for the data acquisition etc,
are you going to be able to take several shots before you shoot your selected target?

IMHO, I would use the cold shots for the basic info, then shoot a couple of shots and see the difference,
this would be more realistic info, I think.

HTH's,
Don

[Sh00ter]

Good point on the hunting thing.

I am trying to look at the potential of my guns for hunting, but if I am testing say 4 different types of pellets in a session, I didn't want the first few shots to bias negatively against the first pellet tested because the gun is cold. BUT, I am not willing to go to the trouble of testing each pellet with a cold gun...so therefore, to be consistent, I will probably fire a couple shots before chrony when the gun is cold, and just know that there could be a slight FPS difference if hunting with a cold gun. That will provide the most consistent data.

[subscriber]

I think that a pumper "waking up" from storage is "a thing".  That said, and increase of 5 FPS on a hunting capable velocity, hardly seems like you would notice a difference in point of impact on a 50 yard target.  Not under field conditions...

[19Sheridan57]

   I believe you are over-thinking .

[Ribbonstone]

What could it hurt?  So you "waste" a few shots having fun...then go for the chronograph.  May not help...can't see where it would hurt.

[fwbsport]

The multi pump hand lever pneumatic should work cold and hot to same point of impact.

I have the 1377 and the 1322 and I can shove 10 cranks into either to get what they do very accurately.

The chronograph just records velocity.

What you are able to hit with a pistol downrange in accuracy may prove otherwise.

Velocity consistency at the muzzle is not the final test of accuracy ability downrange hitting what you expect to hit offhand or benched or rested in any rifle.

Hitting the target consistently is the idea at whatever range you set yourself up for.

Actually, velocity numbers on a chronograph mean nothing.

[Ribbonstone]

What do you do?  Do you shoot it a couple of times, to see if it actually works and  shots to a at least a simple "feeling" that it's normal.


Even with gagued PCP's,have found gauges that LIE.... got stuck on  2200psi even when they were empty of air..got stuck on empty then they were full of air.....have had springers/SSP's  that "turded" the seals while it was in shortage..SSP's and  MSP's that seemed to need some "limbering up" of parchure  tupe pump-seals.

Of do you NOT shoot  it at all...just out the safe after being ignored for 3 ot 7 months....set all that &^^& up,and go immediately to a chronograph shot string?

Dude...may not make any differnce in an often used/not neglected airgun...but It does in everything/every power plant tye  that has been stashed away for a few months.

[Sh00ter]

On the 1377 it made a small difference:

https://www.gatewaytoairguns.org/GTA/index.php?topic=181942.0

[fwbsport]

The Daystate Huntsman gauge on mine is always in line with my MK IV Hill pump with silicon beads and copperwork beading to remove all moisture in filling and has been the hand pump I've use since Pomona Air sold me the first Tarantula and the first Black Widow FX in .22.  I also use the Hill to pump up the 250 BAR HW44 which teaches me a lesson regarding CO2 and hand pumping.

Those rifles never wavered and neither does any Daystate Huntsman from 1999 to date in any caliber.

I finally got .177 in Daystate PCP to realize it is better than .25 or .22.

I have 50 accurate shots in a sitting with my Daystate Huntsman .177.  With any other regulated or non-regulated PCP it was NOT possible.

Accuracy and accurate shots over and over and over is what I'm about using these rifles OFFHAND.

You can settle behind a 6.5 powder rifle and hail it to the end but if we are in the air world the Daystate Huntsman PCP is the best PCP to buy. 

I will defend the Daystate to the end but I will leave FX in this territory.

Besides I have the Harper Patent on my Daystate which is a slingshot arrangement independent of hammers coming down on PCP air release hammers of other types not doing what they are SUPPOSED to do consistently which is release the proper amount of compressed air to consistency in multiple shots.

All this is true of the HW44 I have in .22.  That pistol is a rifle with a scope at any range an air pistol should be used for.

Crosman?

Come on spend more and get it right the first time around without disappointment.

Compare a Crosman with an HW44 handgun (all handgun stuff here) and report back.

[subscriber]

An equipment check before going far is always a good plan.  It does not have to include a chronograph, but that can't hurt.  Most safari camps will make you shoot a few shots to prove your rifle (and you) shoot to point of aim at 100 yards, before taking you into the field. 

If a particular PCP has been in storage for some time, you may want to shoot over a chrono as a quick way of proving it is set up to do the job at hand.  You might have detuned it for air conservation and forgotten about it...  Shooting it at a paper target at 50 yards should accomplish the same thing - velocity a few 100 FPS lower than your hunting set-up is likely to shoot low at 50 yards.

[19Sheridan57]

  I shoot ALL my rifles on a rotating schedule, so they are always ready to go. I do chrony a rifle at times. If I suspect it has lost power, after a rebuild, & most often when a potential buyer asks for test results.

[fwbsport]

I am beginning my data acquisition journey on my airgun collection and starting with my stock Crosman 1377. I did two 5-shot groups and the second group was a ~5fps higher avg than the 1st group. It got me thinking, if I am going to do chrony runs, do I need to warm up the gun with a few shots before I begin to record the data? I was trying several pellets types/weights in an evening and some groups were in immediate sequence (pump still warm) and some were with a beer rest between moving to the next pellet. I just want to be sure I am gathering things in a consistent-enough manner to judge the gun's performance for potential hunting.

Is there a standard way of conducting chrony testing with pumpers? Also, of course if a warm barrel matters, I'd be curious to see what the process should be for any type of air gun.

Thanks!

I missed saying the point two days ago.

The PCP is supposed to be consistent from first "cold shot" to last.

If it isn't consistent it lacks design to make it so.

To Make It So get Daystate.