Can a magazine (AICS Pattern) influence POI or Accuracy?

[z7.jled]

Looking on another internet forum and I ran across an individual who has shot rifle competitions for many years. Palma, F-Class, Benchrest and service rifle. it seems his competitive days were 20-30 years ago. he is very knowledgeable but his opinion often runs counter to what I have read here. He does not believe in gripping a rifle or loading a bipod for example.

he has made the claim several times that magazines often cause a POI shift and each magazine causes a different POI. his recommendation is to find magazines that share a common POI and use them.

I do not see how this is physically possible when shooting a precision bolt action rifle using a bipod/sandbag/rearbag type of shooting. if there is no pressure or stress placed on the magazine and it does not place odd pressure on the rifle in any way, how can a magazine impact where the bullet flies?

has anyone EVER seen a bolt action rifle has a POI shift due to using a different magazine?

I think the guy is full of **** when discussing a bolt gun. I can MAYBE understand a semi-auto with the more forceful closing of the bolt and impact with the feel ramps.

 

[Devildog]

I'm with you I think he's full of bs!

 

[morganlamprecht]

my bolt guns dont care if theres a mag in, out, single fed, etc...bullet has the same POI

 

[SubOptimal]

I could almost see this happening in the early days. Feed lips do vary from mag to mag and the bottom metal is not always installed correctly. Add a little tolerance stacking and maybe the bullets were being slammed into the rear of the barrel with certain mags and knocked askew. I know one of my AIAC mags for my 6.5 CM will not reliably feed 140 Bergers loaded to magazine length. The damn thing loads 140 ELD fine. The Bergers, bang nose on into the bottom of the barrel rather than feed into the chamber. My solution was to not shoot the Bergers from a magazine. I single loaded them and they didn't offer any improvement in that gun anyway.

 

[txfireguy2003]

Consider this possibility, not saying it is true, but I think plausible:

Loose tolerances between bolt body and bore of action allows a slight wiggle under recoil of just a few thousands. Add a magazine with rounds loaded, top round is going to press against the bottom of the bolt. Different mags have varying spring rates due to wear, so some will press harder than others, causing the bolt wiggle to be inconsistent. Inconsistency causes changes in POI, so I'd see it as maybe, kinda sorta, theoretically plausible, but is it measurable? Maybe in a 0.0X moa rifle in the "Houston Warehouse". Otherwise, I doubt it.

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[z7.jled]

I had never seen it discussed here, and the hide has some really great marksmen, so i assumed it was either a legacy of m14's or simply a myth the old man believes

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[...]

The poi shift probably comes from having to break your position to load a mag....nothing to due with the mag its self

Another thing you need to remeber, is just because someone competes for many years....doesnt mean they are any good at it.......any yahoo can go out and buy a rifle ans start shooting matchs