View Full Version : 300blk zero
What is everyone using for zero? Seems on other forums most supersonic is at 200 which give about a three rise between zero and 200 and lets you hit out to 230 with 200 zero with no hold over. Does this seem correct. Will be using a eotech red dot.
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That is what I would do - 200 yard zero. I am not saying you need to sight in literally at a 200 yard range - you can sight in at 100 and just be high at 100.
That is what I would do - 200 yard zero. I am not saying you need to sight in literally at a 200 yard range - you can sight in at 100 and just be high at 100.
Roughly how high at 100yds for 200yd zero Ron?
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Roughly how high at 100yds for 200yd zero Ron?
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What others are suggesting on other forums is abot 3" high at 100 for 200 zero wish i knew where it crossed zero at on the way out. like with a 223 it crosses at 25 and then back at 300. No one says where it crosses going out just at 200?
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About 2.75 to 3.25 inches, depending on the ammo.
Thanks! I will start there then confirm at 200yd.
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About 2.75 to 3.25 inches, depending on the ammo.
Cool glad to get it here just do not trust some of the other forums like i trust the guys here.
Any idea where it crosses zero on the way out?
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I have posted that on this site before.
I have posted that on this site before.
Sorry i tried searching and could not find it. found a lot of threads but not one with clear zero info. Maybe using wrong search term?
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For subsonic:
For the 9 inch, it is 15 yards/88 yards.
For the 16 inch, it is 16 yards/93 yards.
For the Barnes ammo and a 16 inch barrel, do a 33.5 yard zero and it will cross over again at 200 yards and will be 2.8 inches high at 100 and 3 inches low at 232 yards.
For subsonic:
For the 9 inch, it is 15 yards/88 yards.
For the 16 inch, it is 16 yards/93 yards.
For the Barnes ammo and a 16 inch barrel, do a 33.5 yard zero and it will cross over again at 200 yards and will be 2.8 inches high at 100 and 3 inches low at 232 yards.
Awesome thanks. got some 147 grain pnw ammo coming for just plinking in the new 12" noveski that is in transit as well. Will probably pick up few round of better ammo locally for sighting it in but wanted some cheap stuff for initial sorting out of the new upper. Again thanks for info, 30 yards sounds like it should get me on paper at 200 when i go to sight it in.
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Robert. What do you use to get these numbers?
Jeremy
just started with my 300blk rifle. i only have a 25yd range close by, where would i need to zero to be on at 200 with the remington factory ammo? 16" aac upper shooting 115gr ctfb and 220gr subsonic. i know they both will be different, just need to know the 25yd zero for each.
found this, i figure zero at 25 yds would be +1.3" to be on at 100 so ill do quick and dirty +1"
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As you can see, you can use the 115 UMC with the same trajectory as the 125 grain ammo. The 115 is faster, but has more drag, and the drop works out to the same to at least 300 yards.
The 220 has a G1 BC of 0.704, and is typically at 1000 fps.
Range Velo Time of Energy Path Deflection Total Sight correction Target
city flight to at crosswind drop for setting new lead
LOS of 10.0 Mph zero range 33 fps
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ˇYards fps s ft.lbs. in. in. MOA in. Clicks MOA yds ˇ
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| 0 1000 0.0000 488 -2.5 0.0 ----- 0.0 ------ ----- 0.00
| 50 986 0.1500 475 +3.2 0.0 0.00 4.3 -17.7 -6.10 1.64
X 100 973 0.3030 462 +0.1 0.5 0.50 17.5 0.0 0.00 3.31
| 150 960 0.4585 450 -12.3 1.5 0.95 40.0 +23.0 +7.92 5.01
| 200 948 0.6162 439 -34.2 2.8 1.36 72.0 +47.7 +16.41 6.74
| 250 937 0.7758 429 -65.8 4.5 1.74 113.7 +73.3 +25.21 8.48
| 300 926 0.9371 419 -107.2 6.5 2.08 165.2 +99.5 +34.22 10.25
| 350 915 1.1000 409 -158.7 8.8 2.40 226.8 +126.1 +43.39 12.03
| 400 905 1.2642 400 -220.3 11.3 2.70 298.4 +153.1 +52.67 13.83
| 450 895 1.4313 391 -292.9 14.3 3.03 381.1 +180.9 +62.23 15.65
| 500 885 1.5989 383 -375.7 17.4 3.32 474.0 +208.8 +71.82 17.49
| 550 876 1.7690 375 -469.8 20.9 3.64 578.2 +237.3 +81.63 19.35
| 600 867 1.9412 367 -575.4 24.9 3.96 693.9 +266.4 +91.63 21.23
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The 125 Match ammo has a 0.320 BC, and is typically at 2230 fps from a 16 inch barrel. This is currently the most likely military ammo.
Range Velo Time of Energy Path Deflection Total Sight correction Target
city flight to at crosswind drop for setting new lead
LOS of 10.0 Mph zero range 33 fps
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ˇYards fps s ft.lbs. in. in. MOA in. Clicks MOA yds ˇ
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| 0 2230 0.0000 1380 -2.5 0.0 ----- 0.0 ------ ----- 0.00
| 50 2107 0.0694 1232 -0.3 0.4 0.72 0.9 +1.6 +0.57 0.76
X 100 1988 0.1421 1097 0.0 1.3 1.27 3.8 0.0 0.00 1.55
| 150 1872 0.2192 973 -1.8 3.1 1.95 8.8 +3.5 +1.19 2.40
| 200 1762 0.3026 862 -6.3 5.9 2.82 16.4 +8.8 +3.03 3.31
| 250 1657 0.3914 762 -13.6 9.7 3.70 26.8 +15.2 +5.23 4.28
| 300 1557 0.4850 673 -24.0 14.3 4.56 40.4 +22.3 +7.68 5.30
| 350 1462 0.5832 593 -37.8 19.8 5.39 57.3 +30.0 +10.34 6.38
| 400 1375 0.6892 524 -55.9 26.6 6.35 78.6 +38.9 +13.37 7.54
| 450 1295 0.8020 466 -78.7 34.6 7.34 104.5 +48.6 +16.73 8.77
| 500 1223 0.9209 415 -106.5 43.7 8.35 135.5 +59.2 +20.38 10.07
| 550 1161 1.0470 374 -140.5 54.0 9.38 172.6 +71.0 +24.41 11.45
| 600 1108 1.1793 340 -180.8 65.5 10.42 216.1 +83.8 +28.81 12.90
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The upcoming UMC ammo is 115 grain, and about a 0.300 BC, and about 2250 fps from a 16 inch barrel.
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Range Velo Time of Energy Path Deflection Total Sight correction Target
city flight to at crosswind drop for setting new lead
LOS of 10.0 Mph zero range 33 fps
-------------------------------------------------------------------------------------
ˇYards fps s ft.lbs. in. in. MOA in. Clicks MOA yds ˇ
-------------------------------------------------------------------------------------
| 0 2250 0.0000 1293 -2.5 0.0 ----- 0.0 ------ ----- 0.00
| 50 2118 0.0690 1146 -0.3 0.4 0.77 0.9 +1.7 +0.58 0.75
X 100 1991 0.1415 1012 0.0 1.4 1.37 3.7 0.0 0.00 1.55
| 150 1867 0.2186 890 -1.8 3.3 2.09 8.7 +3.4 +1.18 2.39
| 200 1750 0.3025 782 -6.3 6.3 3.01 16.3 +8.8 +3.02 3.31
| 250 1639 0.3920 686 -13.6 10.3 3.94 26.8 +15.2 +5.23 4.29
| 300 1533 0.4865 600 -24.1 15.2 4.84 40.4 +22.4 +7.70 5.32
| 350 1434 0.5866 525 -38.1 21.1 5.76 57.5 +30.3 +10.42 6.42
| 400 1344 0.6952 461 -56.7 28.5 6.80 79.2 +39.4 +13.56 7.60
| 450 1262 0.8103 407 -79.9 37.0 7.85 105.6 +49.4 +16.99 8.86
| 500 1190 0.9328 362 -108.8 46.8 8.94 137.6 +60.5 +20.81 10.20
| 550 1129 1.0622 325 -143.9 57.9 10.05 175.8 +72.7 +25.02 11.62
| 600 1078 1.1983 297 -185.9 70.1 11.16 221.0 +86.1 +29.62 13.10
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Rsilvers
300 AAC Blackout has as much energy from a 16 inch barrel as 5.56mm from a 24 inch barrel. You get 8 inches of barrel for free.
I think I would push it to a 200 yard zero and not worry about the 24 inch drop at 300 with a 100 yard zero.
The upcoming UMC ammo is 115 grain, and about a 0.300 BC, and about 2250 fps from a 16 inch barrel.
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Range Velo Time of Energy Path Deflection Total Sight correction Target
city flight to at crosswind drop for setting new lead
LOS of 10.0 Mph zero range 33 fps
-----------------------------------------------------------------------------
ˇYards fps s ft.lbs. in. in. MOA in. Clicks MOA yds ˇ
------------------------------------------------------------------------------
| 0 2250 0.0000 1293 -2.5 0.0 ----- 0.0 ------ ----- 0.00
| 50 2118 0.0690 1146 -0.3 0.4 0.77 0.9 +1.7 +0.58 0.75
X 100 1991 0.1415 1012 0.0 1.4 1.37 3.7 0.0 0.00 1.55
| 150 1867 0.2186 890 -1.8 3.3 2.09 8.7 +3.4 +1.18 2.39
| 200 1750 0.3025 782 -6.3 6.3 3.01 16.3 +8.8 +3.02 3.31
| 250 1639 0.3920 686 -13.6 10.3 3.94 26.8 +15.2 +5.23 4.29
| 300 1533 0.4865 600 -24.1 15.2 4.84 40.4 +22.4 +7.70 5.32
| 350 1434 0.5866 525 -38.1 21.1 5.76 57.5 +30.3 +10.42 6.42
| 400 1344 0.6952 461 -56.7 28.5 6.80 79.2 +39.4 +13.56 7.60
| 450 1262 0.8103 407 -79.9 37.0 7.85 105.6 +49.4 +16.99 8.86
| 500 1190 0.9328 362 -108.8 46.8 8.94 137.6 +60.5 +20.81 10.20
| 550 1129 1.0622 325 -143.9 57.9 10.05 175.8 +72.7 +25.02 11.62
| 600 1078 1.1983 297 -185.9 70.1 11.16 221.0 +86.1 +29.62 13.10
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I was just thinking, I don't have my barrel yet to try this, but if you were using an eotech and used the bottom circle of the reticle as your 200yd zero, do you think the main center dot would be close to your 50-100 yr zero?
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