Fx crown spiraling
- Thread starter dye29
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Spiraling is usually caused by a poor fit between the pellet and barrel, damaged pellets, a dirty barrel or shooting the pellets at too high a velocity.
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.25 cal 912fps reg 145 at 100yrds id add a vid to show you but not sure how , it seems bang on target at 50yrds but started recording today at 100 and noticed they fly off to right , i have cleaned barrel with cotton pull throughs never used brass or anything wasnt sure if i could
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What pellet or slug? I would guess that's the key, like Biohazard suggested. Regardless of the projectile, I wouldn't think 912fps would be causing problems, that's not that fast. Certainly way, way below, not even close to reaching transonic speeds.
Stoti
Stoti
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Its hard too say when its started as ive always been playing and tuning but only started recording , my setup now is ported barrel and probe would this cause that and hammer weight my tune was 145 reg then adjust hammer until i reach 900 on max and 885 on ( as ive been told from max to 5 either 15-20fps is a good tune
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Unless your porting job is damaging the pellets on the way in I doubt that this is your problem. To know for sure you can pull your barrel and push a pellet through with a cleaning rod then inspect it closely for damage. Hammer weight should have nothing to do with it. What pellets are you shooting?
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Hi just tryed pushing pellets through barrel they are touching but looks even all way around pellet kind of like hexegon 
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The pellet looks normal. If you can, try indexing the barrel liner while you shoot groups to get it to the tightest group size. Then play with the tune a little to fine tune the long range accuracy.
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No damage to your pellet is plain so I went and pulled out my stx .25 pellet liner out and pushed a MKll through it it looks much the same as yours. Nothing stands out in the difference between pellets other than mine is a bit more smooth where it hits on the barrel. All I can say is try to figure it out by process of elimination try different pellets, try shooting pellets slower like mid to low 800s, clean your barrel more? There is nothing that stands out glaringly as a problem here.
Like stated in the post above it's always good to see that your barrel is indexed although I do not believe it would cause your spiraling condition it still should be done to get the most from your gun.
Like stated in the post above it's always good to see that your barrel is indexed although I do not believe it would cause your spiraling condition it still should be done to get the most from your gun.
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right guys update from today ive removed slug liner and tried my other brand new slug liner fully cleaned , retuned the rifle again too 900 max but actually shooting on 5 at around 880 , 50 yard zero pellet on pellet every time the fps is very consistent too , fully removed scope and refitted making sure level and tight reg 145 sounds lovely actually shot a pigeon at 72yards down it went so set up a 6" disc at a 100yards and can't even hit it its doing the same bloody thing and theres no wind at all im really clueless now I will try 25gr pellets another day but I don't think it will be the pellets , im starting to think im using a pard nv007 it won't be that will it also the only other thing ive changed is gauges I removed them and added a dive gauge to gun to set reg up and released the bottle pressure gauge was 70bar under so used dive gauge to set these then marked gauge where to fill .
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I do not know to much about slug liners, but could it be because they have faster twist rates, it spins to fast for pellets beyond 900 fps? If solwing the problem is to shoot at lower speed, then that probably is the solution.
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last 2 things ill check tommorow is I have a moderator on remove this and test also index the liner then give up haha
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You should get more consistent FPS with the more efficient chamber flow, so the port job isn't the issue.
There are a few good tuning videos out there on YouTube for the Impact's. The basic premis to all of them is to try a different speed by increasing 5 bar at a time using the regulator adjustment and the other adjustments set on max. Shoot 3-5 shot group's at each setting to find the tightest group. Then go back to that reg setting and use just the valve stop adjuster to slow the speed and find a good harmonic tune based on shooting more groups. Because you are grouping good at 50 yards maybe go to 75 yards with a big cardboard backstop to watch the group's instead of 100 because you are going to have multiple groups to look at.
Don't give up, ha ha!
https://youtu.be/xxi3Vj0lkVI
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ye think im ready to sell this ive played all day wasted tins of pellets , ive tried both slug liners indexed both of them and still same its been a flat calm day no wind at all ive then tried the pellet liner which does seem better but still curving to left I don't know what else to check now ive gone through the whole gun
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Just curious, is this a new problem or has it always been so? How long have you had the gun?
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You say it’s consistently going left. Do you mean at one specific distance? Spiraling can sometimes be eerily consistent enough to produce a somewhat consistent POI at one distance but usually there will be some apparent left/right randomness. What does it do at different distances?
Of course if you can actually observe it corkscrewing in flight, then forget those first questions.
However if it’s always landing to the left, you’re probably fighting a canting problem. Either the scope is indexed incorrectly to the bore or you’re holding the rifle at a slight angle when you’re shooting.
Of course if you can actually observe it corkscrewing in flight, then forget those first questions.
However if it’s always landing to the left, you’re probably fighting a canting problem. Either the scope is indexed incorrectly to the bore or you’re holding the rifle at a slight angle when you’re shooting.
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