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Mine is the standard version, 860 is perfect for long-range shooting.

To Daniell, Good idea, i will do it as a spare solution; To mtnGhost, i opened a new tin for the test, sorted and weighted, i totally tired for the testing work, will change to BAT and enjoy the shooting ^_^

Good idea! i will try it, and the bat is on the way now.

Tested without shroud in the field, shot 2 magazines, no spiraling, no shift. confirmed it caused by the clipping, ordered BAT silencer, i think this is the final solution... it's very hard to install the stack to the exact position that doesn't clip...i know it can be done, but it's difficult...

1,Inspect crown and barrel, no burrs with cotton swab, see pic 2,Magzine exit is fine and smooth, 3, pushed a pellet out of barrel by hand, the pellet looks fine, but have no idea if it's too tight or not 4, I am sure the gun is new from ED to me, so nobody ever modified it. 5...

Checked speed with Chrono, it's consistent, change velocity by 5 is a good idea, I will do it and see any change.i shot several magazines, it looks happened every shot

Thanks feinwerk, the torque is 12lbf, it should be right, the mostly reason I doubt is the movement of plastic stack, I will align it careful ly and then check grouping.

1, checked mag and probe alignment , it's normal; 2, checked o-ring of mag, tested pushing pellets out with pencil, it's fine! Have to test grouping without shroud and stack in field for another day.

To David and feinwerk, all are very good ideas, I will try one by one.

Thanks BH, it's there before I removed the barrel, to be honest, I am not sure when it began, I found it from the GoPro footage, and then found the problem some periods videos.

i checked the rifling by removed the barrel off last week, it's clean and no damage...

Just checked the alignment of the barrel, it's perfect as what i aligned last week, no change, there is no burr what we called crown, and very smooth... maybe a deep clean of barrel?

The attached link is the footage of spiraling, 60 yards https://www.dropbox.com/s/q82nhvohfehpafw/footage.mp4?dl=0

What is the CROWN? you mean head of the pellet or what?

As the topic title mentioned, R5M.25 use 25.39Gr JSB pellet, 860fpe, having pellet spiraling problem, it affected accuracy a lot, checked pellet skirt, the skirt not damaged, cleaned barrel, the problem is still there, anyone any idea or had the same issue with me?

Aligned the barrel today, everything looks normal so far, totally followed https://www.airgunnation.com/topic/edgun-r5m-barrel-alignment-procedure/, great!

I checked two videos from ED's youtube channel about how to disassemble R5M, especially the video about how to take off the barrel of R5, could not find any comment on this issue, r5m is a beautiful tank, but this little carelessness is really a problem for accuracy.

I just checked the barrel alignment, it rotated about 10 degrees to the left, show as the pic, i suppose this caused the POI shift by reinstalling the baffle stack, because of the small movement of the plastic stack, there will be a light slapping between pellets and the stack, this will not...

The barrel nut is very tight, I am not sure cranking down on the tube can do that, it looks many R5M users have such problem....