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Posted: 11/15/2006 9:33:28 PM EDT
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Based on some excellent recommendations from members of this forum, I have a new NF 8-32X56 NXS inbound. Thanks to all for that. The scope will likely be going on my Cooper M22 bolt action in .22-250 with bull barrel. I'm seriously considering the NF Unimount to mate the two together. When searching the online ads I'll often see descriptions such as the following: NEW ULTRLIGHT Uni-Mount 1.275 w/ 20moa I realize the "1.275" refers to the height of the rings, but I'm a bit embarrassed to admit that I'm unfamiliar with the "20moa" reference. Also, with the 56mm obj on the scope, which mount height would likely work best on this rifle? |
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Nice taste in optics. You'll be very happy with the NF. And don't be embarrassed about your question. We all need to start somewhere. Before I answer your question, let me back up a bit and talk about scopes, namely the elevation turret. All scope manufacturers list the total amount of travel the adjustment turrets can handle. I believe your NF is around 100 MOA in total adjustment. What isn't advertised is the fact that the scope comes from the factory with the internal erector tube centered in the main body. The eretor tube is what actually moves when you adjust the turrets, and it is the erector tube that determines point of aim. The thing is, a centered erector tube means your 100 MOA travel is actually only 50 MOA in each direction. For the elevaton turret, that's 50 MOA up and 50 MOA down. The NF base with 20 MOA you're asking about is actually a slanted base. It is slanted to aim the scope 20 MOA low, the same as turning your elevation turret 20 MOA. Using this 20 MOA slanted base. you would then zero your scope by actually turning the elevation turret DOWN 20 MOA. By doing so, you are gaining more travel distance in the UP direction. Now you have 70 MOA UP instead of the original 50 MOA UP. This extra UP adjustment is then available for use when adjusting your zero for extreme ranges, say 1000 yards or more. If you tried adjusting for these extreme yardages with a 0 MOA base, you may run out of internal adjustment before you reach your zero. Sorry, I can't help you with the correct ring height. |
+1 What he said.... 
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Internal adjustment of the 8-32 NSX is 65 MOA, other than that everything Glock24 mentioned applies. [The 3.5-15 and 5.5-22 are 100 MOA] The uni-mount is going to put the optic up too high for a proper cheek weld. Additionally the uni-mount must clamp to a picatinny rail, which will make that mound sit even higher. The uni-mount is really better for mounting to an AR platform. Unfortunately I do not know who makes a picatinny rail for a Cooper but if you can’t find one you may be able to get US Optics to make one for you as they have been known to make some custom mounts from time to time. If weight is a concern you can use Aluminum or Tiatanium rings and base(s). Also keep in mind that NF NSX tubes are slightly oversized and if you do not lap and good machined scope rings (which IMO is a MUST) it will leave some nice ring marks on that new scope of yours. Without having much expirence with Coopers and not knowing exactly what base and barrel profile you will have its difficult to say what height rings to use. I would guess you should be around a 1” high ring. Good luck and do it right; you have thus far and will end up with one damn nice rig if you continue. |
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I agree with SniperM88. A 1913 rail with some quality rings is the better option for your Cooper and NF. US Optics lists rails for the Cooper 21 and 57M. Check out this PDF file under the "BASES" listing on page 2. Look here |
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