FX Some troubles with Fx panthera...Spread is ok, POI is crazy

[Doc_pafumo]

Hi all. I have some issues with my Fx Panthera. I´m shooting pellets JSB 18 grain at 1000-1050 fps, to 30-45 m and have too much changes in POI. The gun is very consistent, SD 1, spread 5…I know it´s too hot for pellet, so i started shooting slugs NSA 31 grain, but the problema continues, very consistent but the POI is crazy…Maybe too near? do i need clean the barrel?

 

[MrP]

Hi all. I have some issues with my Fx Panthera. I´m shooting pellets JSB 18 grain at 1000-1050 fps, to 30-45 m and have too much changes in POI. The gun is very consistent, SD 1, spread 5…I know it´s too hot for pellet, so i started shooting slugs NSA 31 grain, but the problema continues, very consistent but the POI is crazy…Maybe too near? do i need clean the barrel?View attachment 548633

Too many times when I've been driving myself crazy over things like this it's been some kind of slight slight clipping in the moderator

 

[Hobbyman2007]

Are you sure the slugs you are shooting are sized for the barrel you have? That’s the tough part with slugs, .001” plus or minus in size can make all the difference in the accuracy. Get yourself a good mix of sizes first, find the one that shoots the most accurately, tune your rifle to get the best from that one slug. There are way too many YouTube stars making it look like it’s a simple process by showing a ten minute video. What they don’t show is the long process and costly I might add finding the correct size.

 

[DNF]

Dial the 18s down to 880 and see if poi stabilizes. Then you know equipment is fine and you just need to perfect tune and find a projectile that works at that tune.

 

[steve-l]

Is the POI shift occurring in the same session or is the POI shift session to session?. Do you verify the barrel to moderator alignment with a test rod? My point here is to not make any changes to anything until you know what is occurring. Right now you are only making wild ass guesses.

 

[Max115]

I think your speed is too fast for these 18gr pellets. Try them 850-950 fps.

 

[Corvid_hunter]

As the others have suggested, slow it down and remove the moderator for testing. Reinstall it when you have the POI issue figured out.

 

[Ranchibi]

Like said above and like you wondered, yes, clean the barrel! Hope it shoots fantastic for you

 

[Impact701]

I am wondering what length barrel you have ?
If you have a 600 or 700 mm barrel, both of those lengths come with a slug liner.

 

[Doc_pafumo]

Thanks everyone for the tips! I’ll try your suggestions. Slugs are 0.218 — I’ll test 0.217 and some other weights too. My barrel is 700mm, but I shoot pellets with the M4 extender and it’s pretty accurate. I thought maybe the moderator was the issue, but I don’t see any scratches or clipping. Reg is set at 80 bar and micro on 1… yeah, too hot for pellets, true — but I guess with slugs those problems might go away

 

[Hobbyman2007]

One more thing. Push a slug through the barrel and check for tight spots. Then inspect the slug, look for uneven rifling marks , lead smearing or any other defects the probe or barrel may have done.

How hard is it to chamber a slug in the barrel. That is usually a good indicator.

 

[Airgunmann]

Cranking pellets at the speed is something they weren't designed for and is going to give you corkscrews and flyers

 

[Airgunmann]

I bet a lot of us have played the same game i know i have push them as fast as I can and maybe my gun will like it that way or we try something else each looking for secret sauce I came to conclusion if I need it over 900 fps it might as well be a slug

 

[SilentSquirrel]

Seems to me that solving a poi issue with pellets and slugs at the same time can be confusing
Choose on or the other for your diagnosis.
When the first ammo is solved move on to the other
For me, I would start with pellets

Just my too poi
Edward

 

[JackHughs]

Too many times when I've been driving myself crazy over things like this it's been some kind of slight slight clipping in the moderator

I have a .22 700 cm Panthera. If you remove the shroud, the POI will change. If you then loosen the two screws on Part No. A12 (Valvetube End), the POI will change again. Try shooting the rifle with the shroud removed and the two screws loosened.

And, my Panthera had an out of spec carbon fiber tube over the barrel. The tube was putting inconsistent force on the barrel.

JackHughs

 

[Kneepit]

Too many times when I've been driving myself crazy over things like this it's been some kind of slight slight clipping in the moderator

Exactly what happened to me with my GK1 Shadow suppressor….. tiny clipping and ruined the whole experience. Have you tried shooting without the moderator to see if that does the trick?

 

[MrP]

Exactly what happened to me with my GK1 Shadow suppressor….. tiny clipping and ruined the whole experience. Have you tried shooting without the moderator to see if that does the trick?

I'll tell you I've done this enough times that I should've learned... the last time I realized I had wasted an afternoon due to clipping I wanted to give myself a sound beating.

 

[Doc_pafumo]

I gotta put together a rough work plan. First thing, I’ll clean the barrel, try a different scope, and shoot without the moderator… using .217 slugs and JSB pellets from the Caldwell bench...

 

[Joedirt199]

Check to make sure the small delrin discs that hold the liner in place have not moved down the liner during shooting and are allowing the end of the liner to whip around too much and affect points of impact.

 

[Kneepit]

I'll tell you I've done this enough times that I should've learned... the last time I realized I had wasted an afternoon due to clipping I wanted to give myself a sound beating.

At least it only took you an afternoon, it took me effing 7 different types of ammo, and I was thinking, wow this sure is a picky gun