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M-77 accuracy tip

This is a discussion on M-77 accuracy tip within the Ruger Bolt Action forums, part of the Rifle & Shotgun Forum category; I am extremely grateful for this tip. To test things I removed the magazine box in my M77 Hawkeye .243 and my groups improved by ...


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Old February 25th, 2014, 01:00 AM   #16
 
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I am extremely grateful for this tip.

To test things I removed the magazine box in my M77 Hawkeye .243 and my groups improved by approx. 30%.

I have now filed down the mid sections of the fore and aft bottom of the magazine box. I actually had to remove more than I expected for the aft end - approximately 1mm. Look forward to my next visit to the range and hope see the same improvement.



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Old June 6th, 2014, 02:57 PM   #17
 
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Yes . Thank you very much ! I didnt have this problem with the factory stock but when I mounted the barreled action into an aftermarket stock I wasn't getting the accuracy I expected.
I filed on the front and rear inlets on the bottom of the mag box and the groups went right down to sub half inch . This is with my 6.5 Creedmoor . I very much appreciate you posting this info. This factory rifle with only a quick trigger improvement and this mag box fix . As far as metal work goes is now ready to shoot to long distance.
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Old June 7th, 2014, 11:52 AM   #18
 
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you guy's are trouble, i have been fiddling around all winter w/ my .06 NOW I HAVE TO CHECK THIS OUT &see if i have any rattle in mag box .so i can see if i can close my groups to.5" . i just thought it was me not the rifle later.
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Old June 7th, 2014, 01:20 PM   #19
 
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could someone post pictures & torque specs . my m77/.06 is a 1997 and the box mag fits thight up in to the action where i have gently pop it loose w/a screw driver and the bottom plate lug[?] dose not make contact/ mag box @ all, i stoned the bottom back of the mag box made it all tight and still had to pop it loose in place in the rifle but it did move some what . i would not call it " shaky ". i am a tradesman and not with tools ,i just don't want to make a mistake playing around w/a rifle i like very much just because i'm bored thanks
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Old June 7th, 2014, 01:23 PM   #20
 
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'dumb ***' insert [lost ] with tools duh
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Old June 8th, 2014, 11:24 PM   #21
 
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With my factory stock in place I had other problems with accuracy. Some from the barrel contacting the stock but most from not being able to get a comfortable , repeatable grip, trigger finger placement and sight pic from the bench.
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Old June 9th, 2014, 01:04 AM   #22
 
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I've never had any accuracy problems with my M-77 Mk II Target in .308 Win, but I went rushing over to the gun safe to check out the mag. box. Sure enough, it rattles real good. I just never noticed it LOL.
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Old December 18th, 2014, 05:17 AM   #23
 
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This post (and many like it) are the reason why I joined this forum. Great post. I'm diggin 'em all out today to start that magazine inspection evolutions.
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Old December 18th, 2014, 07:39 AM   #24
 
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So for the last few hours Ive been working on my 7x57, 250 Sav and 220 Swift.

I checked all the magazines and ALL were locked up like they were hammered in. Using the tips from this thread I went ahead and used a small mill file and some jewelers files and some super fine emory cloth and cold blue and I cant believe it but they all move slightly now (they make a tiny bit of noise and I can feel 'em move). Awesome.

Because of how the Swift's magazine has a built-in lip in the front and fits a little differently by design, I polished in more places than just the lug recesses from where the trigger guard lug positions the magazine in the stock and the lug attached to the floor plate screw area. In no case should these lugs be used to "press and hold" the magazine well in the rifle. They are meant to be a guide or position the well, that's all. That's my assessment.

I can't believe that I hadn't noticed this naturally, especially the 7x57, as I use that rifle a LOT.

Although they were all good shooters, especially the Swift, I have noticed that they are much more susceptible to spread widening between loads...like one load will give me an 1" @100 yds and the next might give me 4". I just experimented until I found the best load, as anyone would have. Interesting that the COALs of those loads were significantly different as well, not that I see a correlation.

Its freezing here now, but I intend to get out there this weekend with those rifles and I am grateful to you guys. BIGTIME.
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Old December 18th, 2014, 09:18 AM   #25
 
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Update to M77 Accuracy Tip

The original thread has surfaced again! Glad to see some M77 shooters benefiting from this tip. Chief Big Nuts asked for a picture which I have attached. This is a shot of the mag box bottoms where you file. The left mag box is stock OEM and the right mag box is after filing. The rear of the boxes are closest to the lens and the front of the boxes are furthest. BassMan had suggested filing rather than using a dremel tool and this is a good improvement I have made in my technique on doing this. It is easier to go slow, smooth and accurate. The rear of the boxes is closest to the lense and the front of the box is furthest. My measurements show that I filed .049" off the back and .041" off the front. Spare Ruger .308 OEM mag boxes for M77 MKII and Hawkeyes are available from Midsouth part # 723149 which is Ruger part # D22700 for $10.

Best Regards,
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Attached Images
File Type: jpg Left Stock OEM Right Filed.JPG (225.5 KB, 166 views)

Last edited by Regnitteo; December 18th, 2014 at 09:23 AM.
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Old December 18th, 2014, 09:49 AM   #26
 
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This was my first ruger, and I immediately joined this site for all the advice I could get.

The original poster of this thread said he read about this fix in one of the gun rags years ago. With that in mind I'm curious why this adjustment isn't taking place at the factory. Seems like a simple enough thing to check by the folks putting these guns together.

Quite frankly, the groups I was getting were driving me crazy. Was it the screw torque, was it the scope, what the heck was it? There was just nothing consistent about the groups to develop any conclusions, and all I was hoping for was 1.5" consistency. Stumbling across this tip was a real blessing. The grouping now is turning heads at the hunt club.

Wonder how many M-77 bedding jobs were the result of this issue?
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Old December 18th, 2014, 12:34 PM   #27
 
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Quote:
Originally Posted by SCgman View Post
Wonder how many M-77 bedding jobs were the result of this issue?
More than a few, I reckon. I really cant wait to find out how different I shoot with these mods.

Good tip. And Regnitteo, good info about Midsouth having the boxes in stock. I imagine that the boxes are the same for the M77 as they are for the Mk2. I dont seem to recall a difference this morning. I also honed the outsides of the bent feed lips that are located at the bottom/rear of the boxes in your photo. The sides of those lips actually touched the sides of the stock when the mag box is positioned in my 250 savage and all fasteners were tightened. This had the effect of pushing down on the box and again, creating a pillar out of the mag box.

I used some emory cloth and a dremel and polished this down (too much makes for bendable lips) to a mirror. I took off maybe .002 or .003. Now it does what its supposed to do.....not be a pillar and MOVE.

Last edited by Pitiguns; December 18th, 2014 at 03:18 PM.
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Old December 18th, 2014, 03:01 PM   #28
 
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The older M77 (tang safety) and the newer MK II / Hawkeye magazine boxes are different, at least for .308 Win. My old M77 .308 held 5 rounds in the mag while my newer MKII's and Hawkeyes only hold 4 rounds of .308. I have not pulled them apart to compare sizes, but they all responded very well to making sure the magazine box was not tight and acting like a pillar.

Reg
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Old December 18th, 2014, 03:49 PM   #29
 
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Thank you for this tip Regnitteo! I'm betting my MKII is experiencing the same thing and I will fix it up as soon as I get a chance!
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Old December 18th, 2014, 07:28 PM   #30
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I have several M77's and have found that its best to leave them in their original factory issued condition. Mine do what they were intended to do, so why mess with them? Altering in most cases devalues the gun, and if not done right, risks making things worse than before you started.

Last edited by BHB; December 18th, 2014 at 07:32 PM.
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