Cricket changing poi
I noticed today or it sunk in that between a full tank and half a tank my poi shifts exactly two clicks left. When tank gets to half I need to turn it 2 clicks back. I was shooting sparrows today between 55-65 yards. Dropped them like flies. So at 72 yards a pigeon lands on barn roof. I line up for a broad side shot and made a clean miss. 😡 I was really scratching my head as to what went wrong. Soon a sparrow landed on tree where I had shot a bunch a few minutes ago and missed it too and saw I was a bit to the right. I adjusted scope 2 clicks and was back in business for the remaining clips. Anyone noticed anything like this with their cricket
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Eelect, I think what it is is you’ve been lax in shooting all summer and probablly forgot how to shoot. My advice is to stop working and pick up the pace on your shooting skills like me and all your troubles will go away……………… :8:
Zonk
I did some checking this afternoon and did loosen the stock screw as it was more than snug. I also found that the one barrel clamp screw was tighter than the rest of them and needed to adjust torque wrench to get it loose. After i got them all loosened I re torqued them and went out to check poi. I took 3 shots at 50 yards at the preasure from the previous day i had the poi shift. I filled gun to 230bar and fired another 3 and would conclude it was very close to but still a small shift to the right. There was an increase in wind coming from the left that could have influenced the small right shift. Time will tell if its acceptable or not.
Here’s one area that I check during a tune:
On or about 180b in the AT, while the stock is on Loosen all barrel clamp screws then pull barrel off the action about 2″ and slowly insert back—-> a properly aligned barrel will have an even clearance entering the action with an even o-ring compression —If miss aligned the barrel will hit the lip of the action then you force the barrel in—now the barrel has more metal contact on one side and is more subject to POI change.
key points—- don’t bottom out the barrel to the action leave about .5mm clearance and have a even o-ring compression —> in other words keep the barrel free floating in the action so when the air tube flex (action is attach to the firing valve) due to changing pressure will minimize POI change.
If the barrel hit the action left or right ===== the action grubscrew #26 aft screw not centered with firing valve flat indent—-the AT clamp was tighten
without checking firing valve and action proper alignment.
The barrel, the Action, the Air tube and stock bolt hole must be properly aligned Before The MONO block / AT / barrel clamp #86 are tighten down!!!!!
I remember reading a post on the yellow where someone sold their cricket due to exactly this poi shift. I didn’t put much importance to it figuring that there was something else contributing to the poi shift.
Are the changes to the NEW .25 cricket “aimed ” at this poi shift?
Dave
You might also switch scopes to check out the Hawke. I’m sending a HK4013 in for a warranty look-see. It was mounted on a Dyotat build Condor, w/ a lot of mods. On initial setup, all was well, then, several hundred shots later, serious poi drift. Checked all the obvious stuff. My guess is because the scope was not shimmed and the w/e adjustments were significant (high rings), the turret adjustments are dancing around. There’s a regulator on the pellet setup and the slug setup had the pressures/speeds figured out, but both setups shifted poi at the same time. Two tanks, two valves aren’t likely to start shifting at the same time, so it appears the scope is screwy. ❓
There are a few things that can cause a moving POI, first I’d say is a tune that went south or an untuned unconsistant shot string. Did you shoot it over a chrony from full to half full to see if it’s holding velocity? The hammer spring or main valve setting could have backed off or the reg could be leaking. Also as stated already tighten rail clamp at medium fill in proper sequence, and check or replace breech oring in barrel.
http://www.youtube.com/watch?v=_sw_-iZVG8I&list=UUbmysxe6_F975u202x7Kszg
I want to do that with my gun.
whats a guy do? just put the gun at desired pressure then loosen the bolts and then simply tighten them on down? or is it more complicated with even a torque pattern and spec?
I did that right from the get go. But will try it again at the pressure I’m seeing the poi change. Or something moved after I did the readjustment
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No, i have only had for a few weeks.
But…, do I remember that if you fill your air reservoir to about 50-60% of the range you shoot within and then loosen the scope rail towers and then re-tighten them that could help reduce the air tubes distortional effects which might be able to cause a POI shift..?
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eelect did you any adjustment or reassemble on your cricket before? Was it done only from the factory?