Ruger m77 markii long action magazine length?

zr600

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is there a way to get a mag length opened up on my Ruger m77 markii it’s currently a 270win and with 150s at the lands it won’t feed out of the mag. Somebody was saying you can have them opened up for longer loading was thinking about building a 7mm Sherman off this gun so I wanted the extended length.
 

MagnumManiac

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To extend the mag on these, part of the ramp has to be removed, new inletting has to be made for the extended box to fit into. And a new box has to be made to suit.
I wouldn’t bother.
Why do you need to load at the lands anyway?
There’s always a sweet spot away from the lands and this can be as much as .100” away.

Cheers.
:)
 

zr600

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It’s currently at 3.439 is what it measures now I was thinking about the 7mm Sherman which I would need at least 3.6.
 

Shane Lindsey

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Thats long. My 300 WM tang safety is right at 3.34". I load at 3.335" for reliable feeding and to ensure the tip doesn't deform with recoil.

I have found the sweet spot with them and it's a looooong jump, but it can be found.
 

codyadams

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You can get them quite long....my smith installed a Wyatts extended box (3.850" I believe??) in an M77 and chambered it in 338 Lapua.
 
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codyadams

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And here is another Ruger .338 Lapua he built for one of his customers with a Wyatts extended mag box. Also, He did not take any out of the feed ramp I guess.
ruger 338.jpg
ruger 338_2.jpg
 

codyadams

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He did state that it was a pain in the ***, so I guess it would just depend on if it was worth it for you and if your smith would do it. This guy has a liking for Rugers, so he didn't mind. I'm having him put together a .264 win mag on one right now, it was a 300 win mag. If I run into an issue with OAL, I'll just have him install a standard Remington 700 mag box, that will get me 3.700" anyway, plenty for a .264 WM.
 

zr600

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Could you pm me the name of your smith aslo who did the extended mag work.
 

Shane Lindsey

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Cody,
What brand of rings are you using on your 338?

I had slippage with my Vortex and Ruger rings. Thinking Leupys may get a try.
 

codyadams

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Cody,
What brand of rings are you using on your 338?

I had slippage with my Vortex and Ruger rings. Thinking Leupys may get a try.
That is not my .338, but I have burris ruger to weaver bases, then burris signature zee rings with 25 MOA of cant in the inserts. No issues on the gun as a hard kicking 300 WM.
 

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