Tweaking the mag for better accuracy
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Old 05-08-2012, 11:57 AM   #1
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Default Tweaking the mag for better accuracy

I have mentioned that I tweak my mags for better accuracy from my minis, I used a pair of channel lock pliers or lineman pliers to bend the front of the feed lips up slightly. My best shooting mags is a Promag 20, the steel is easier to bend, so don't give up on cheap mags. I have been working with some of my factory 20 and 5 rd mags to get them shooting better but it takes longer because they have stronger steel. The first picture is the tweaked mag showing the slight upward bend on the feed lip. The second picture is a stock mag for comparring. I bend both sides of the mags, the factory is tough to bend so be careful, it's easier to bend up but bending down is even tougher.

tweaked-mag.jpg   untweaked-mag.jpg  
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Old 05-08-2012, 03:14 PM   #2
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How does altering the feed lips effect accuracy?

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Old 05-08-2012, 03:49 PM   #3
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Quote:
Originally Posted by mountainman13 View Post
How does altering the feed lips effect accuracy?
my thoughts excactly
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Old 05-08-2012, 04:32 PM   #4
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Quote:
Originally Posted by mountainman13 View Post
How does altering the feed lips effect accuracy?
Some people are reporting a change in POI and group size from one magazine to another. Many report better accuracy with Ruger 20rd mags as opposed to the Ruger 5 round magazines. The thought is the spring tension and lip configuration play a roll in the amount of force on the undeside of the bolt causing some difference.

With the 5 round magazines many report a consistent 3 and 2 pattern. Three shots grouped tightly and then another two offset and also fairly tight. Some people report just the first round off from the other four with the grouped four being very tight.

One school of thought is the first round is stripped using just the manual retraction and release of the bolt. The rest being stripped by the gas system propelled movement of the bolt. And this causes a change in the flight path in some way.

Tri70 has labeled each of his mags to track performance and has come up with these tweaks. He seems to have done the most extensive tracking.
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Old 05-08-2012, 04:37 PM   #5
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Hmm first I've heard of it. Very interesting and when explained so well it does sound like a mechanical probability. Very cool.

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Old 05-08-2012, 06:57 PM   #6
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I noticed this affect several years ago, I handload and no the ammo is accurate out of my bolt gun. I would load different mags with good ammo and get different groups and poi and that got me on this path.

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Old 05-08-2012, 07:04 PM   #7
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I posted a target in the Reloading &ammunition forum under the Alliant Varmint powder. I got a good group with a 1 at shot flier and the next 4 printed close to 1" . This was done with my Primate 20 rd. My target mini will shoot almost 1" every time with this mag.

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Old 05-08-2012, 07:05 PM   #8
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Very cool.

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Old 05-08-2012, 11:17 PM   #9
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Ditto, that's cool. I have never thought about the magazine affecting accuracy.

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Old 05-09-2012, 04:42 PM   #10
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could alternating tension both vertically (reducing tension with firing) and laterally( staggered ammo) cause bolt to move around and cause case to move around in chamber? bolts have slop front to back as well as side to side. feed lips moves up hold constant tension on bottom of bolt

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