How high is low? (LOL)
Never was too deep into rifles, so I don't know: Are Model 77 rings the same as those for a #1?
If so, this might help.
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Option 1
Millett Angle-Loc™ Steel Rings
MEDIUM: R-.510 F-.397
HIGH: R-.623 F-.510
(These apparently have a little 'elevation' built-in?)
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Option 2
Ruger 30mm Ring Mount 4B30HM Matte Medium @ Midway
B = 0.500
(Sounds about 'right' - LOL)
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Option 3 (cheap, but probably effective)
Barska 30mm Low Ruger Style w/1" Insert Ring
"Note: Only one ring"
(Sold singly, NOT in pairs; also available @ Midway)
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Let me know if you need more info. 
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Complete thread:
- In search of... -
Hoot,
2013-06-30, 12:11
![[*]](themes/default/images/complete_thread.png "Open whole thread")
- Not available???? -
Gunner,
2013-06-30, 12:22
- My results as well. - Hoot, 2013-07-01, 07:58
- S&K -
brionic,
2013-06-30, 12:35
- I hadn't considered (forgot about really) them. - Hoot, 2013-07-01, 08:07
- I will chat with leupold Monday and ask -
Rob Leahy,
2013-06-30, 20:22
- Thanks Rob! - Hoot, 2013-07-01, 08:08
- How high is low? (LOL) - FOG, 2013-07-01, 01:06
- For Comparison Only (Burris 1" Low Rings; 0.410") -
FOG,
2013-07-01, 01:55
- Central ignition M77's use the same rings but -
Hoot,
2013-07-01, 08:48
- I would probably call Ruger - FOG, 2013-07-01, 10:31
- Central ignition M77's use the same rings but -
Hoot,
2013-07-01, 08:48
- Not available???? -
Gunner,
2013-06-30, 12:22