Not spiraling .177 pellet + barrel pairs.

[skorec]

For now I believe that if the accuracy decrease dramatically (10 times ) at longer distances it is case only via/by  spiraling or wind.
I believe also that at the top of trajectory ( 25-50m ) start spiraling most of  pellets and bullets by using lot of barrels.

Here are my not spiraling pairs long time tested at velocities 270-290 m/s  up to 75m :
1.   7,87gr  JSB Express   + LW/CH, QB78 China
2.   8,44gr  JSB + LW/CH   
3.   10,34gr JSB Heavy  + LW/CH, BSA/CH, Kral 
4.   13,43gr JSB Monster REDESIGNED + Weihrauch/CH + LW/CH,
5.   21gr Piledriver + LW/CH , LW Poly/NCH   

Notices
1.   Weihrauch/Choked barrel spirals 21gr Piledrivers  !!!
2.   LW Poly/NCH spirals 13,43gr JSB Monster REDESIGNED !!!
3.   Each my barrels spirals old style 13,43gr JSB Monster
4.   Each my barrels spirals pellets at the picture.
5.   When we were shooting only up to 30m we did not know that the pellets may be too  danger over these distace.
6.   Longer pellets are spiraling more. 

Which are yours .177 pairs ?

[skorec]

I have forgotten mentioned that unfortunately next bullets are spiraling via all my mentioned barrels .
https://nielsenspecialtyammo.com/collections/177-caliber/products/17-caliber-sample-pack-21-18-and-15-5-grain-slugs