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Ask Foghorn: Zero Distance for 300 AAC Blackout?

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Seth writes:

What are you using for zero distance for your blackout? I am big fan of the 50/200 zero in .223/5.56 and I am hoping there is something similar for the blackout round. I did a little experimenting on trajectory software, but didn’t come up with anything concrete.

The good news is that the old 50 yard zero works pretty well for 300 BLK as well. Here’s why . . .

300 AAC Blackout is a fantastic hunting round. So long as your target isn’t much over 100 yards, that is. While having a chunky projectile is a nice improvement over the standard 5.56 cartridge, it does mean that you lose some muzzle velocity. And in turn, the trajectory past 100 yards for this gun has been described as “rainbow-like.”

However, over that 100 yards the trajectory is remarkably consistent. With a scope height of 1.5 inches, the parabolic arc of the round peaks at 50 yards and returns once more to -1.5 inches at 100 yards. Or, in terms of hunting, a variation of less than the profile of a deer heart over 100 yards.

In my opinion, the 300 BLK round is the perfect gun for game under 100 yards away. Or, in other words, just about anything in South Texas (where I live). But when you start moving past 100 yards, its time to break out the zippier calibers. At 150, the round has dropped 6 and a half inches. At 200 its almost a foot and a half down.

http://www.youtube.com/watch?v=4AgJm3T8ub0

I’m not saying that it can’t be done. I’m regularly singing steel at 250 with my 300 BLK rifle, with a nice +3.4 Mil hold. But that’s not a shot I would be comfortable making on wildlife. Not humane.

And that’s why I like the 50 yard zero. It keeps the trajectory nice and flat for the distance that I’m comfortable killing things, but once you reach the end of that 100 yards its like the thing falls off a damned cliff. You could get a little more distance out of a 25 yard zero (under 1.5 inch drop at 150 yards), but then the bullet moves through a little over 3 inches of variation over 100 yards compared to 1.5 inches with the 50 yard zero.

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0 thoughts on “Ask Foghorn: Zero Distance for 300 AAC Blackout?”

  1. I have to agree with several of the comments about the one that feels best in your hand. I personally don’t like the feel of the Glocks and tried the Xds, OK but still not quite right. My favorite is still the M&P full size. I shoot consistent 2.5 inch groups @ 25 yards and it just feels right. No lights, just TFO sights. It seems more accurate at the range with lead loads than jacketed so more fun for same money. My vote is M&P 40. Just plain black and functional. Takes any ammo I’ve thrown at it and asks for more.

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  2. Interesting thought Bill, and I think most folks are inclined to agree that Lanza’s mother probably should have taken more steps (including better storage of her firearms) to prevent her son from doing it what he did… though at this point, hindsight is 20/20.

    Thanks for speaking out!

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  3. Can someone tell me how in the HELL they’re going to enforce a ban on the sale/transfer of so-called “high-capacity” magazines? If I sell one to a friend, how are they going to know? And we all know those criminals obey the law, don’t we?

    This is effing madness.

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  4. This is definately awesome! And, with the price of 3D printers coming down a little more every month…it’s possible this is the wave of the future. Now, all someone has to do is figure out how to print with a polymer compound rather than ABS and we’re set!

    http://defcad.org/

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  5. thanks for your time guys.My son bought a 300 blk out single shot the handy rifle 1-7 twist 16” barrel.he got his suppressor after 8 months of paper work.he wants to use it for deer hunting he will be shooting at most 100 yards more so inside that.at what yardage should he sight it in at and is the 220 gr bullet the best one for him.he will be shooting subsonic.thanks again.jim and adam
    if he sights it in at 50 yrds how low will he be at 100.

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  6. I don’t mean to be, well, mean. But the near-parabolic trajectory of any and all bullets fired from a firearm is easily corrected by range estimation and sight adjustment.

    I’m an ex-Marine (and I don’t intend to argue one damned bit with another Marine about using the term ex-Marine vs. former Marine, such argument seems to be perfectly ridiculous to me). In the Vietnam era we zeroed the M-14 at 200 yards.

    Now, I understand that they zero the M-16’s at 300 yards. Who cares?

    Calculate a dope table with whatever zero floats your boat, tape it to the butt of your rifle, or, shrink it to fit within a rifle scope lens cover or do what I do and use a wrist coach (much larger and much easier to log dope in 25 yard increments), use some form of range finding, and learn to adjust for elevation (and windage, if you have a ballistic calculator). Then every shot is a hold on COM.

    LF

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  7. I’m getting coyotes and stray cats and dogs roaming my property. I live on a hill top so if my 300 BLK over penetrates, how far would you think the round would travel?

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