Sub MOA How Far

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Out to 420 yards for me so far. I've achieved a few sub MOA groups in the 410-415ish yard range. After shooting over 400 yards for several weeks in a row I'm convinced my Impact is as consistent as the conditions will allow. 

I'm shooting 28.3 grain swaged slugs in .22 at 980fps. Magazine fed, untethered, and with a moderator.

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@ Swish- NSA shows your slug to have a BC of 0.09 and you still sling them 400 yds on target 👍. Could you share which liner, length and Reg pressure you use. 

We might see 500 yds before year end.

Score Board 

1. Swish - 400 yds, 0.78 MOA, 22 Cal

2. Scotchmo- 328 yds, 0.9 MOA, 257 Cal

3. Flintsack- 235 yds, 0.76 MOA, 22 Cal

4. Steve123-200 yds, 0.75 MOA 22 Cal

5. LewisP12- 196 yds, 0.9 MOA, 30 Cal
 
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At these distances, the scope setup becomes a significant factor in POA. My Athlon Ares ETR has 110moa of total vertical adjustment. Or 55moa from center. I've got 50moa built into my scope mounts. About 12moa to get my zero at 37 yards, and maybe 8moa of droop from the heavy barrel.

50moa-12moa-8moa = 30moa

55moa+30moa = 85moa of vertical adjustment from zero

I reality, I only get about 80moa before I hit the stop. And I like to keep it at 75moa (3 turns) or less. That gets me to about 400yards. Any more and I combine some reticle holdover as well.

To keep my intended POI within my FOV, At 30x max magnification, I have about 22moa of reticle holdover available in the FOV. That would get me out to about 485yds.

At <15x magnification, I can use the lowest stadia on the reticle. That's 42moa of holdover. That should get me out to 555yds. So the 500m berm is at least reachable in theory. I don't know yet whether I will attempt that far.

300m seems OK, but are longer distances even practical for subsonic rifles? Over 2 seconds of flight time and over 60ft of drop at 500m.
 
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I spotted for Scott ( @scotchmo ) at RMAC this year, and I can tell you he was just about dead on at all ranges except the one target that he missed high twice (actually one of the shorter ones, I think 185 Y, but don't quote me on that). Many of the targets were at a pretty steep upward angle, so it took some skill to estimate the POI. I watched every one of Scotts slugs fly smooth and true all the way to the targets. Very impressive gun and also very skilled shooter. Scott is one of the best FT shooters in the country if you don't know him...
 
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So many incredible groups at such extreme ranges! We are certainly blessed to have this technology available to play with. I’m really looking forward to trying out past my range limit of 130 yards sometime soon. I don’t have much confidence in my Rapid .20 at 860 fps with the 13.73 grain pellet past 130 yards though lol! The tiny pellet will catch a breeze like a kite! Thanks for sharing your groups, very inspiring.
 
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@ Scotchmo

You make a very good point that the scope setup becomes a significant factor in long distance shooting. I only have 80 MOA on my scope and it doesn’t help that I am only shooting my 30 cal 85 gr HP/RBT at 860 fps ( most accurate speed). ChairGun shows that if I have a 55 yard zero and shim my scope and have 65 MOA adjustment, I should reach out to 290 yards. When I reach 290 yards and still at sub MOA , I will reassess my setup.

I read that you are currently shooting 70 gr cast slug with a BC 0.16, have you tried NSA 257 cal, 70 gr BC 0.2. Or even 75 gr BC 0.2. The reason I ask, I have only tried RBT slugs in my 30 cal after reading on GTA, articles written by Bob Stene, how RBT are better suited for shooting long distance in the wind. 



 
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@ Scotchmo

…
I read that you are currently shooting 70 gr cast slug with a BC 0.16, have you tried NSA 257 cal, 70 gr BC 0.2. Or even 75 gr BC 0.2. The reason I ask, I have only tried RBT slugs in my 30 cal after reading on GTA, articles written by Bob Stene, how RBT are better suited for shooting long distance in the wind. 
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I recently tried 86.5gr 257388 slugs ar 995fps. They are at 0.2 BC but I’m maxing my gun out to get there. They seemed a little less accurate but still good. 190fpe is a little much for this gun so I decided to stick with the 257420 BT for now. I tried some 82gr Griffins early on but also not as good as the 257420 BT. I might try some others later but I like casting my own. I got some powder coating that I want to try. 80gr or less at under 170fpe probably best for this gun.
 
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Scotchmo

As I previously stated, I have only shot RBT from my air rifle and have no idea how Flat Base slugs will shoot. I have ordered 50 off 56 gr, 62 gr and 68 gr which I should receive in the new year. I have 195 fpe on tap at 125 bar Reg pressure and should be able to push the 68 gr slugs 1000 fps plus. 


I notice all the groupings posted here so far, have been shot with knock open valve air rifles, no Air Force air rifles ( in-line axial valve). I know they develope high power and a quick YT search shows world records been shot with Air Force rifles. 


If you watch what groupings the guys are shooting, they won’t feature on the above leader board. Am I miss something ?





 
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Out to 420 yards for me so far. I've achieved a few sub MOA groups in the 410-415ish yard range. After shooting over 400 yards for several weeks in a row I'm convinced my Impact is as consistent as the conditions will allow. 

I'm shooting 28.3 grain swaged slugs in .22 at 980fps. Magazine fed, untethered, and with a moderator.

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Holy moly what is that scope?? I cant see my 22cal holes even at 200yds but with that scope so visible even at 400+?!? Even on paper.. damn.
 
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For the last half of last year, I had removed my 30 cal barrel and installed my 224 cal barrel on my Jkhan. I knew how accurate the 30 cal barrel is, maybe the 224 cal can be better. 


Yes it was better, …. at breaking the valve, 5 times in total. To get good accuracy I had to drive the 44.6 gr slug over 1000 fps. It was just too much stress for the valve that had an o-ring on the stem, it broke every time at this spot.

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Something interesting did come out of the time spent with the 224 cal barrel. I tested a simple home barrel tensioner . 
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On seeing how far the guys are shooting (300-400 yards) it has motivated me to fix my Jkhan and have another go at Sub MOA, How Far.











 
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