I would probably call Ruger
And confirm the factory spec (0.500" base-to-bottom-of-ring).
If your scope has much of an ocular lens, a magnification ring, or a ring to adjust reticle focus, you might find that height just about right.
Being just 0.090 higher than the Burris 1" rings I had on my #1, I have a feeling they'd probably work fine for your application.
Thanks as well for the M77 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