POI Shift based on left vs. right side of mag feeding... Fudd Lore or something to solve?

[Greedmoor]

I'm not shooting dozens of groups to test this, but many past (good, sub 0.7 MOA) groups seem to be split in some way and I do wonder if this is the reason. If YOU have went down this rabbit hole and tried to eliminate a POI difference, what were your findings and solutions?

 

[308pirate]

POI shift based on which side of the magazine the rounds come out of?

Sounds like bullshit

 

[Forward543]

Really does sound like bullshit. If your rifle is not grouping, very unlikely the side of the mag the round came from is the issue.

 

[Near miss]

I'm not shooting dozens of groups to test this, but many past (good, sub 0.7 MOA) groups seem to be split in some way and I do wonder if this is the reason. If YOU have went down this rabbit hole and tried to eliminate a POI difference, what were your findings and solutions?

I read one article telling that magazine affected accuracy, presumably by applying pressure onto bgc. I would see this more of a problem with gun than magazine, as magazine pressure changes a lot while it gets empty.

Remove the upper and press the bgc, see if it has a lot of wiggle room. Some is ok.

An easy way to test your theory is to shoot 2 groups, one shot on each at a time = on group per side.

 

[Near miss]

I very much doubt this is the case but we should never refuse to test anything because of prejudice.

 

[Neurotic]

Single load a group without a magazine in place? Would isolate a bunch variables.

 

[Supersubes]

Single load a group without a magazine in place? Would isolate a bunch variables.

Variables in his head maybe.

 

[Neurotic]

Variables in his head maybe.

Well, they're real differences... They just may not amount to much in practice.

I had a barrel that would pull shots not so randomly. Turns out the left side feed ramp would gouge projectiles. Wouldn't have issues feeding with the right feed ramp or hand fed. Chamfered and cleaned up the ramps and the cheap barrel shoots surprisingly well.

 

[Supersubes]

Well, they're real differences... They just may not amount to much in practice.

I had a barrel that would pull shots not so randomly. Turns out the left side feed ramp would gouge projectiles. Wouldn't have issues feeding with the right feed ramp or hand fed. Chamfered and cleaned up the ramps and the cheap barrel shoots surprisingly well.

That's not the observation the op is making though. Yours caused poor accuracy, the op’s bullets shift

 

[Dino11]

On my 6mm ARC's I have mags that load left and right, and I also have some Amend 2 mags that are single stack at the top of the mag and they only feed from the right side. I have not seen any measurable difference from either style of mags. I have a Uintah bolt upper coming very soon, it is a bolt action AR 15 rifle. I will test this theory with this gun to see if it has any effect on it, but I doubt that it will make any difference. One of the rifles I have shoots .5 MOA at 100 yards and rarely shoots any thing over .75 MOA.

 

[NHR]

Possible. I noticed some odd flyers a few years ago from my AR. Isolated it to a Gen2 20rd Pmag. This is 2 separate 3 shot groups on top of each other. The first round out of that PMAG would consistently have a different POI from the rest of the group. 1st round is just below the bull, next 2 rounds low left.

I switched a G3 Pmag and it went away.

 

[hlee]

Easy enough to test. Put up a target paper with 2 aim points. Alternate shooting the aim points. If there is something to this then you should see a bias. If not, Fudd lore. My vote? Fudd lore.