AR15.Com Archives
 *** OPTICS for the 300 AAC BLACKOUT ***
Overton-AR  [Team Member]
2/20/2011 3:46:57 AM
What optics are you guys running on your 300 BLK's??

I am going to be shooting strictly sub-sonic ammo. Since that is the case, I have just about decided
that a standard red dot is going to be of little or no use. The bullets trajectory is such that the red dot
will only be POA=POI for a VERY SHORT distance. Which leaves the huge question....at what distance
do I want that to be. If I make my ZERO at 100 yards, then at 50 the POI is over 6 MOA (about 3.5") high.
At 150 yards my POI is 7.7 MOA (about 11") low. For me that is not acceptable. It leaves a lot of work
for the shooter to figure "hold overs" and "hold unders" for most of the bullets travel.

The idea I have been toying with is to use a low power BDC scope. I have an ACOG TA11 that I have
been trying to sell for a few weeks. I decided to transpose the 300 BLK trajectory onto the ACOG reticle
BDC calibration and see what I would get. I used the trajectory of the 220 gr. Sierra MatchKing going
1000 fps. This is what I am aiming for with my reloads. My TA11 has the "red donut" reticle. I am toying
with different zero yardages and zero reference points in the reticle. The one I like best on paper so far
is to ZERO at 50 with the TOP OF THE DONUT. This gives me usable yardage points out to 230 yards
which is probably as far as I will ever care to shoot this gun accurately.

I will post more details as I "tinker" with this idea. Any feedback or thoughts would be great.
Paid Advertisement
--
kala_azar  [Team Member]
2/20/2011 9:27:38 AM
I'm in the same boat - if the TA11 reticle will work that would be my first choice for sure...

If not, I'm probably going to go with something from the Leupold Custom Shop and have them do a custom reticle doe the 220 or the 208 A-Max

I like their 1.5-4 VXIII, or whatever it is, and the cost is not bad at all considering the custom touches
Overton-AR  [Team Member]
2/20/2011 3:47:19 PM
Originally Posted By kala_azar:
I'm in the same boat - if the TA11 reticle will work that would be my first choice for sure...

If not, I'm probably going to go with something from the Leupold Custom Shop and have them do a custom reticle doe the 220 or the 208 A-Max

I like their 1.5-4 VXIII, or whatever it is, and the cost is not bad at all considering the custom touches


That would be nice. A 1-4 low power optic with custom reticle is exactly what is needed for the 300 BLK.
kala_azar  [Team Member]
2/20/2011 10:39:50 PM
I am also considering getting a scope I like for it's clarity, reticle, size, price, etc., and then adding a set of these
tailored to the subsonic load I'm going to be shooting.

I like the idea of these because you could get a new set of turrets for each load if you wanted to...
Overton-AR  [Team Member]
2/22/2011 5:42:14 PM
Here is what I have come up with so far.......

Finding the measurements for the ACOG reticle was a chore in itself.
Once I had them I transposed the bullet curve of the sub sonic 300 BLK
across the reticle and this is what I came up with.....

These yardages work with SMK 190-220 Subs with a velocity @ 1000 fps.
The measurements may vary 1-3 yards depending on your bullet weight
whether you choose the 190, 200, 210 and 220.

Just set your 50 yard zero at THE TOP of the "donut" and you are good to
go out to 230. I know its not perfect, but 230 is about as far as I will be
shooting my subs.

kala_azar  [Team Member]
2/23/2011 10:17:53 AM
That's a pretty nice transposition, and if it proves accurate to the real trajectory, it could be a winner.

I've always said the TA11 would be the only ACOG I'd be interested in...
Hoser  [Member]
2/23/2011 1:46:27 PM
For my M-16 I use a Aimpoint Micro zeroed at 50 yards.

My boltgun wears a S&B 4-16x42 zeroed at 200 yards.
Overton-AR  [Team Member]
2/24/2011 12:20:03 PM
Originally Posted By Hoser:
For my M-16 I use a Aimpoint Micro zeroed at 50 yards.

My boltgun wears a S&B 4-16x42 zeroed at 200 yards.


You actually have a 300 BLK bolt gun that is ZERO'd at 200
yards?? With a 4-16 scope?? What do you figure the range
of the 300 BLK to be for you?? This must be a strictly SUPER
SONIC rifle...a sub gun with a 200 yard zero would be almost
useless. IMHO.
JohnnyC  [Member]
2/24/2011 2:35:46 PM
I think a FFP 1-4x with something like the Leupy CMR-2 reticle would be tits.
Hoser  [Member]
2/24/2011 7:57:04 PM
Originally Posted By Overton-AR:
You actually have a 300 BLK bolt gun that is ZERO'd at 200
yards?? With a 4-16 scope?? What do you figure the range
of the 300 BLK to be for you?? This must be a strictly SUPER
SONIC rifle...a sub gun with a 200 yard zero would be almost
useless. IMHO.


Not at all. I mainly shoot 220 Sierras right around 1075-1080 fps. I dont think I have shot a supersonic bullet through it other than during load development.

If you know your holdovers/unders or how many clicks to add, its no big deal. Range the target, add x.xx mils, shoot.

Using Kentucky windage for elevation holds for subs past 150-200 yards isnt smart.

The furthest I will shoot a coyote is maybe 450 yards with a Whisper. 22 BR, 6-284 or 243 is much further.



Overton-AR  [Team Member]
2/24/2011 9:57:18 PM
Originally Posted By Hoser:
Originally Posted By Overton-AR:
You actually have a 300 BLK bolt gun that is ZERO'd at 200
yards?? With a 4-16 scope?? What do you figure the range
of the 300 BLK to be for you?? This must be a strictly SUPER
SONIC rifle...a sub gun with a 200 yard zero would be almost
useless. IMHO.


Not at all. I mainly shoot 220 Sierras right around 1075-1080 fps. I dont think I have shot a supersonic bullet through it other than during load development.

If you know your holdovers/unders or how many clicks to add, its no big deal. Range the target, add x.xx mils, shoot.

Using Kentucky windage for elevation holds for subs past 150-200 yards isnt smart.

The furthest I will shoot a coyote is maybe 450 yards with a Whisper. 22 BR, 6-284 or 243 is much further.





WOW, I am speechless and impressed. Maybe there is more potential
in this little cartridge than I gave it credit. I will have to do some playing
with it and see what happens.

I am not sure what "Kentucky Windage" is, but it sounds like guesstimation.
Recoil737  [Team Member]
2/25/2011 6:44:13 AM
Originally Posted By Overton-AR:
Originally Posted By Hoser:
Originally Posted By Overton-AR:
You actually have a 300 BLK bolt gun that is ZERO'd at 200
yards?? With a 4-16 scope?? What do you figure the range
of the 300 BLK to be for you?? This must be a strictly SUPER
SONIC rifle...a sub gun with a 200 yard zero would be almost
useless. IMHO.


Not at all. I mainly shoot 220 Sierras right around 1075-1080 fps. I dont think I have shot a supersonic bullet through it other than during load development.

If you know your holdovers/unders or how many clicks to add, its no big deal. Range the target, add x.xx mils, shoot.

Using Kentucky windage for elevation holds for subs past 150-200 yards isnt smart.

The furthest I will shoot a coyote is maybe 450 yards with a Whisper. 22 BR, 6-284 or 243 is much further.





WOW, I am speechless and impressed. Maybe there is more potential
in this little cartridge than I gave it credit. I will have to do some playing
with it and see what happens.

I am not sure what "Kentucky Windage" is, but it sounds like guesstimation.


Kentucky Windage is just using the Mill dots/reticles as your hold over vs. actually turning the elevation/windage knobs. The .300 Blackout is impressive in that the subs can get out to 400-500 yards but at that point it is almost more like artillery than a bullet.

Super sonic rounds get out to 500 yards pretty easy without near as much drop as the subs. I had no problem hitting a 6 inch plate consistently at 500 yards with 110gr amax in the .300 whisper.
Paid Advertisement
--