Your Thoughts On My Impacts Seeming Inconsistency

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J

Jim81

Member
Nov 2, 2017
550
35
Wa, United States
It's a .25. Shooting same pellets from same tin. Using a bench rest. I zero it a 50yds and it puts in a nice tight group. I move up to 25yds and the pellets land no where near where I have the scope aimed. I'd expect to be a few inches hi or low but not 4" to the right AND low. No wind. I then get it zeroed at 25 and move back to 50. I'd expect right or left to be pretty close but it's way off. If I aim at the same place I get reasonable groups, not super like it once was. I have cleaned it twice now and it's behaving like it's dirty after only 4-500 shots. I checked all the mounting hardware for the scope and it was all tight just like I left it after torqueing to suggested values.

Put it on the chrono earlier and had a spread of 10 fps in ten shots. It's averaging about 906 FPS. Never went even near getting off the regulator. I have made no changes to the hammer spring regulator etc. The best description is it's consistently inconsistent.. Any way to check if the scope is not holding it's settings? I guess I'll clean it again and move the scope from the Wildcat to the Impact which I hate to do as I"ll have no rifles ready to pest shoot.

I have two steel rats sitting 100 yds away. Earlier I had it shooting consistently and I could hit those rats 4 time out of 5. Remembering those written settings I tried it again. Couldn't even tell if I was hitting the stand the rats are on.

I forgot to say the scope is the Aztec Emerald.

Any suggestions how to proceed to find a solution?? Thanks.
 
What about the scope? Depending on what scope you are using, (I see you are using an Aztec) you may not be any where near the optical zero, in other words you could have it adjusted so that the rector tube is literally free floating. There are several methods of finding the optical zero, Tom has done a few videos on the subject. Depending on the scope, I would try to see where you are in the adjustments by counting revolutions or clicks going down and left, only one at a time as far as elevation or windage, and see where you are in the adjustments? Just an idea, maybe you are already confident it is not the scope?
 
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I'll look into the optical zero Idea. I have no idea what that means. I have turned the turrets to the stop point and then reversed it and counted the turns. I then started the zeroing process in the middle of the two distances.

Maybe a reinstall might work. But I don't understand what variable that would affect. If the scope is tight and can't move shouldn't an aim point be repeatable?

Some of the first zeroing I did there was almost no difference between 25 and 50. I am shooting stock settings from the factory. I think they reg. pressure and FPS are supposed to be tuned for the JSBs and that;s what I shoot. I didn't choose the FPS. If it might make it shoot better at a lower speed I'd certainly be up for trying that.

I have a bubble level on the gun and it's pretty easy to keep it level when shooting from the bench rest.

I look at some of the videos suggested ..Thanks for the efforts to help.
 
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A few things...

Optical zero (part 1) should explain it pretty well for you. Part 2 has some other ways to find optical zero.

https://www.youtube.com/watch?v=SvgOKMX9Gvg

There's a lot of very good suggestions above. I'll add... Check the screws for the top rail to make sure they are tight to the breech block. While your at it, check all the screws you can access just for good measure. Also, look down the breech block compared to the top rail where they meet. Do they look aligned to one another?

If your shots are zero at 50, right at 25 and left at 75/100, it means your scope is not in line with your barrel. One goes "I" One goes "/". Check your scope mounts to make sure they are both flat against the picatinny rail. Check to make sure the mounting bolts are on the same side. 

If none of the above suggestions, or the ones I've added work, You may have a picatinny rail that is just not lined up with the barrel. The only way to fix it is to use something like these scope mounts. AoA sells the ATP66's but, they're for dovetail. I'm sure they can get the ATP90's. 

Have you pulled your barrel out? If so, could you have possibly damaged one of the o-rings that holds the barrel in place? 

Of course, make sure your bolt probe and barrel set screws are tight as well. 

Any chance this could be a magazine issue? A defective mag is rare and should only show itself for a few shots out of a full magazine. But, they'l be the same shots, say shots 5-11. 

Good luck!

Tom
 
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Hi Jim. The o-rings that support the barrel. The ones the barrel pass through when you insert the barrel need changing occasionally. I put 90nbr in there. 

Is it an X barrel ? If so might be worth checking the liner is inserted and torqued correctly. Check your moderator isn’t clipping. See what happens without it

You have plenty of good detectives on your case!

Good luck




 
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To respond to a few suggstions.

Barrel has never been off rifle.

Have seen using the plumb bob for leveling and aligning scope. I do have the Wheeler mounting kit, with the lapping bars and all and mounted it with 3 levels.

then torqued to specified foot lbs. in a criss cross pattern.

Ill shoot it with the end cap off the barrel shroud and check for clipping.

I am beginning to think it's something internal in the scope. Fastest way to do that is to mount the Hawke that's on the Wildcat and see if the same thing still happens to the Impact. The thought is coming to mind more often to sell the Impact, honestly listing all the issues I have faced, and got to plan B. Maybe the FX coming out at the end of the year is supposed to have all the bugs worked out of it. Who knows??
 
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I highly recommend (if you can't get it to shoot straight) to get it tuned by Ernest. I'm not sure if he still tunes due to his new position. Someone please keep me up to date. Also pellet type makes a huge difference, I couldn't for the life of me get mine to shoot the 25s mk 2s well. However it loved the mk 1s and 30 cal pellets :). Buying a Airgun is like a lottery sometimes.
 
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To add more mystery to this situation I am perplexed because yesterday just before I decided to swap scopes I went and tried the Impact again just to make sure I was accurate in my analysis. It's a two edged sword. The thing shot like a champ and was consistently consistent at both 75 and 100 yds. If that's the case then the warped variable points at me. For the life of me I did everything the same an this time it was accurate. All those things, hold, trigger squeeze, sight picture, bubble level level, bench rest, and so on was the same as when it was not accurate. No! I don't drink or smoke funny cigarettes. I'd be happy if I knew it was me and what I did wrong because that way I could work on a solution. At this point I have to say it's 'Gremlins.'

My fear is in a couple of days I'll go out and try it again the same old problem will rear it's ugly head. 

Thanks to all the nice folks who helped with the issue. Following the suggestions I did learn a lot more about scopes and the Impact. If you were a distributor or the factory in this case, would you release a gun to one of the big time air gun shooters without making it perfect by one of your best technicians?
 
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Buying a Airgun is like a lottery sometimes.





Not if you are one of the big time youtube air gunners, they never seem to get the guns with the issues we nobody airgun shooters get.
Click to expand...
Click to expand...

shhhh... I wouldn't say that 

?



Anyways let us know how it goes. This is with the new X barrels? I heard really good things about them. 
 
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