Weird groupings/questions

[SubsonicPhaatties]

I noticed two distinct groups form when shooting at 500 yards. There was a slight cross wind but I kept the same centre hold. My m lok picatinny bipod rail is really loose. I think I didn’t set the rail in properly when I put blue loctite on the screws. It isn’t coming any looser and has remain with the same amount of play. Could it be that the harmonics of the rifle aren’t consistent because of the mlok picatinny rail. My ES ~20fps

 

[ma smith]

why not tighten your rail? I don't understand

 

[whatsupdoc]

Not the first Canadian with loose screws.

What ^^^^^ he said.

 

[SubsonicPhaatties]

It’s not tightening any more, I’ve basically stripped the screws trying to tighten it

 

[whatsupdoc]

If the screws are stripped replace the screws and the nuts.

Correct the issue then test the rifle again.

 

[ma smith]

Then you need to loosen it and take it apart...

That raises a good question of...
how to remove stripped MLOK nuts

i'd ask the gunsmithing forum.

 

[Elopez3]

having a similar problem, i zeroed my Bergara B14 .308 with a Vox s suppressor using 168 gr federal matchking HPBT at 100yds and when i switched to federal matchking 175gr HPBT i got a 5 inch difference in point of aim and point of impact but only on elevation. any advice as to why this happened is welcome.

 

[Aftermath]

having a similar problem, i zeroed my Bergara B14 .308 with a Vox s suppressor using 168 gr federal matchking HPBT at 100yds and when i switched to federal matchking 175gr HPBT i got a 5 inch difference in point of aim and point of impact but only on elevation. any advice as to why this happened is welcome.

Velocity and ballistic coefficient plus barrel harmonics

 

[Elopez3]

Both shot groupings were at 100 yds right after the other, I expected some POI shift but not that drastic. Thanks for the insight