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MO, USA
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Posted: 2/12/2018 2:29:13 AM EDT
[Last Edit: BushmasterGuy77]
What do you guys think? Should I get a 20 MOA mount for my 18" 5.56 rifle? I just built a precision AR and I plan on pushing the limits of the of the MK262 cartridge.
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Posted: 2/12/2018 2:38:27 AM EDT
[#1]
Depends if you want to shoot 5.56/.223 more that 500 yards. Those rounds can do it yet wind is the real issue. I built a 22 nosler cause it was proven yet .224 Valkyrie has come out since. Not sure which will win.,
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Posted: 2/12/2018 3:28:40 AM EDT
[#2]
Most manufacturers list the total travel from top to bottom, and left to right. Going to the extreme in one axis will limit the other.
600yd zero is about 16 MOA above 100yd, and dope within 10 MOA. 1000yd zero is about 45 MOA above 100yd, dope within 20 MOA. For the "limit", that 20 MOA cant will help. |
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Posted: 2/12/2018 10:20:09 AM EDT
[#3]
Quote HistoryOriginally Posted By HighpowerRifleBrony:
Most manufacturers list the total travel from top to bottom, and left to right. Going to the extreme in one axis will limit the other. 600yd zero is about 16 MOA above 100yd, and dope within 10 MOA. 1000yd zero is about 45 MOA above 100yd, dope within 20 MOA. For the "limit", that 20 MOA cant will help. It never hurts. We cannot tell you if you need it, as that depends on your planned shooting distances, and your optic's zero and adjustment range available from that zero. 20 minutes of cant always helps. You are still going to go transonic at or before 900yds, at around 40 minutes of elevation from a 100yd zero (38 minutes from a 200yd zero). I have not found shooting those 77's doing that well after that velocity and range. If your scope has 80-100 minutes of total elevation, it is quite possible you will be at the mechanical maximum without some cant. |
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MO, USA
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Posted: 2/12/2018 12:17:39 PM EDT
[#4]
Sounds like I better be safe than sorry and roll with 20 MOA. I run 20 MOA bases on all my .308s and my 6.5CM. The scope I have ordered is the Vortex Viper PST G2 3-15X. I have access to a 600 and 1000 yard range. Looks like I'll be doing more reading on the 77 grainers and their capabilities. Thanks for the help!
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FL, USA
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Posted: 2/12/2018 1:42:58 PM EDT
[#5]
As a general rule always go with a 20 MOA base, it gives you more options.
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USA
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Posted: 2/13/2018 12:32:20 PM EDT
[#6]
Quote HistoryOriginally Posted By HighpowerRifleBrony:
Most manufacturers list the total travel from top to bottom, and left to right. Going to the extreme in one axis will limit the other. 600yd zero is about 16 MOA above 100yd, and dope within 10 MOA. 1000yd zero is about 45 MOA above 100yd, dope within 20 MOA. For the "limit", that 20 MOA cant will help. |
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MD, USA
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Posted: 2/17/2018 11:58:39 PM EDT
[#7]
There’s also some credibility to the argument that a 20moa cant will keep the glass more centered in the scope when dialing elevation, so the picture would be clearer.
How much it actually affects remains to be seen, I’ve never done a direct side by side comparison, so I couldn’t tell you. But given the fact that a 20moa cant is typically the same price as no cant, you may want to move the scope/mount to something longer range in the future, and there’s no downside to a 20moa cant, the question becomes “why not?” |
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Posted: 2/27/2018 9:00:09 PM EDT
[#8]
IMO the best all around rail for 5.56mm is 10 moa. Several companies make 10 or 15 moa scope bases for flat top uppers.
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USA
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Posted: 3/2/2018 12:38:01 AM EDT
[#9]
Quote HistoryOriginally Posted By FALARAK:
This. It never hurts. We cannot tell you if you need it, as that depends on your planned shooting distances, and your optic's zero and adjustment range available from that zero. 20 minutes of cant always helps. You are still going to go transonic at or before 900yds, at around 40 minutes of elevation from a 100yd zero (38 minutes from a 200yd zero). I have not found shooting those 77's doing that well after that velocity and range. If your scope has 80-100 minutes of total elevation, it is quite possible you will be at the mechanical maximum without some cant. I can push it to 769/929 respectively using the same load with the 73gr ELD (.210 G7, higher MV). I've not tested this bullet beyond 600 yet, but it groups well and the numbers look good. |
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Posted: 3/2/2018 2:54:01 AM EDT
[#10]
ERA TAC makes an adjustable MOA mount that is the cat's meow but it is not cantilevered. It will work on an AR but you have to be mindful of your eye relief or you'll get scoped.
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VA, USA
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Posted: 3/18/2018 3:00:01 PM EDT
[#11]
Originally Posted By BushmasterGuy77:
What do you guys think? Should I get a 20 MOA mount for my 18" 5.56 rifle? I just built a precision AR and I plan on pushing the limits of the of the MK262 cartridge. I have standardized on the Leupold Windplex reticle (for windage) and their CDS dial system (for elevation) in a 30mm tube, such as their VX 5HD 2-10X40 CDS scope, or their VX-3i 6.5-20x50mm Side Focus CDS Target Wind-Plex Riflescope. Keith |
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FL, USA
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Posted: 3/21/2018 12:44:11 PM EDT
[#12]
I am using a Bushnell engage 2.5-10 and from mechanical zero it has 25up and 25 down of travel but based on my 100 yard zero with the mk262 round I was able to turn the dial almost 35moa up with a standard aero mount
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Posted: 4/13/2018 8:11:47 PM EDT
[#13]
My wife’s rifle is 18” .556 with a Weaver Grand Slam Tactical 3-10 mil/mil 1” tube. Now she has no problem with 600 yard shots. 12”/20” targets.
Just a set of Warne rings on the receiver. Still have adjustments to take farther shots. |
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