Fx impact getting inconsistent

Powerbroker · Dec 30, 2019

Hi,

I can tune the gun to hit 1/4 of inch at 60 meters with 5 shots. But as i shoot more, poi gets wider. Then, i have to tune it again using the valve.

Target 1,2,8,9 are tuning shots

target 3, and 4, (3-4 group shots) is the sweet spot but as i shoot more at target 5,6,7, poi are getting wider.

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i have a video but i will need a desktop to upload it.

what could be the issue? Air pressure at the valve tube is 145bar. The bottle is around 250bar. No chrony though

Keyman62421 · Dec 30, 2019

My friend, you have an impact. The Mazeratti of air guns. Beautiful and fast. 24 hr mechanic needed.

Now let's get back to being constructive. Make sure the barrel is tight in the block. Is liner snug and shroud is tight. Watch regulator to see if it is slow to recover and holding the proper bar.

Others will pitch in. There are a variety of factors including the occasional barrel cleaning.

Keyman62421 · Dec 30, 2019

HEY I FORGOT !!! It might be you ( shhhhhhh)!

jps2486 · Dec 30, 2019

Dirty barrel?

drumie · Dec 30, 2019

What moderator are you using? Try shooting a string with out it on and see what happens. But like others said check the simple things first. Also check the scope and rings. Make sure the rings are tight and the scope is good. Also get a chrony. With these guns you really need one to know what is going on.

GQ · Dec 30, 2019

Check the front valve pin. It maybe loosen.

Powerbroker · Dec 30, 2019

Thank you everyone! Noted! I will be going back to the city and visit the nearest shooting range.

my scope is the newest Nikon fx 1000 moa. This will be eliminated in the test.

Cheers to a new year.

mantech30 · Dec 30, 2019

What caliber?

Chuck26287 · Dec 30, 2019

If you don't have a Delrin C3 bumper, check the o-ring if all other items check out. Weird consistency issue have come from what appeared to be a perfectly fine DURO90 o-ring at C3.

bubblerboy64 · Dec 30, 2019

Don’t discount the scope. I have 4 of them one seems to be showing signs of tracking problems.

Ive found consistency is just difficult to get with my impact. What seems to be great on day is average another. Might be me?? Yes that’s always one variable to factor.

Powerbroker · Dec 30, 2019

Thank you everyone for taking time to give a helping hand. All noted.

i am pack and ready to go. City life again

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Powerbroker · Dec 30, 2019

Don’t discount the scope. I have 4 of them one seems to be showing signs of tracking problems.

Ive found consistency is just difficult to get with my impact. What seems to be great on day is average another. Might be me?? Yes that’s always one variable to factor.

Tracking is not an issue because it’s always at maximum zoom

my fx is consistent from the start. Lately, not.

Hobbyman2007 · Dec 31, 2019

I would say the C3 is most likely the culprit. Also the rubber ball in the stroke limiter may have some effect. I don’t know what your tuning process is so it may be something you’re doing. I adjust my reg first , get about 10% higher velocity with everything else wide open, then choke down the power wheel until very close usually within 10 FPS then use the travel limiter to get to the final speed/ best accuracy. At 140 bar regulator pressure the power wheel usually drops or increases velocity between 15 and 20 FPS depending on projectile weight.

Powerbroker · Dec 31, 2019

Hobbyman,

Thank you. That is my tuning process. My .25 cal 600mm barrel with diabolo 25.4 gr pellet is best at 892fps. I think the C3 is the culprit but i have to check the string shots thru chrono and see if the fps drops too wide.

Have a blissful year ahead!!