260REM datapoint at 1672 yards

[Zak Smith]

While shooting this weekend, we had an opportunity to shoot a 1672 yard target. 10x10" square hung diagonally, so 0.57 MOA on the diagonal or about the same area as a 0.65 MOA circle.

Just for grins, I engaged it with my 260 (139's @ 2780 - 2800 fps). I had no dope past 1000 with me, so we had to guess. I started with twice my 1000-yard dope, which was way short and not spottable. Next I cranked it up to max (about 21.5-22 mils on my PMII), which we spotted as impacting approx 3.5 mils high.

I made a couple corrections, and then was "right in there". I hit it on round #6 using 18.7 mils of elevation from a 100-yard zero.

This was approx 60F at 6700'. JBM predicts 17.4 - 17.7 mils (dep on velocity) and 1241 fps terminal velocity, or about 11% over mach 1.

There was likely some headwind. I merely "favored" the LHS for windage.

The 10" plate was mightly small through the 3-12x50 PMII set at 12x. I stopped after the hit on round 6, knowing I was ahead...


............... Larger version of above photo.

 

[arthurcw]

I stopped after the hit on round 6, knowing I was ahead...

And that may be the greatest lesson I've ever learned on this board. Period.

Good shooting.

 

[Dobe]

Way Cool............

 

[Matt304]

What does the sight picture look like at 1600+ yards, very jittery? I can't imagine even staying on a 10" plate very well at that range.

 

[Zak Smith]

What does the sight picture look like at 1600+ yards, very jittery? I can't imagine even staying on a 10" plate very well at that range.

Well, I'm a good rifle shooter so it was pretty steady..

For comparison, it's about like aiming on a nickel at 100 yards.

 

[TexasRifleman]

For comparison, it's about like aiming on a nickel at 100 yards.

So optically can you make out the target or is there some "gut feeling" that the little blob you are looking at is the target?

I can't imagine the view at that range, pretty amazing stuff.

 

[arthurcw]

For comparison, it's about like aiming on a nickel at 100 yards.

I weep with green envy.

Tell us more Great Master.

 

[Zak Smith]

Sure, you can make out the target at that distance. Obviously really clear optics help and I prefer more than 12x for beyond 1000 yards; however, it's what I had with me at the time.

-z

 

[Wes Janson]

A nickel is .835 inches in diameter. 1 MOA is approximately 1.047 inches at 100 yards, making the nickel .7975 MOA. So at 1672 yards, 1 MOA equals 17.50 inches, meaning the nickel will subtend 13.96 inches.

If I did my math correctly, a 10" plate at 1672 will appear the same size as a dot .5714 inches wide at 100 yards.

How was the mirage, Zak? Considering the mirage we get out here at even 500 or 1000 yards, I can't imagine how tough it must be well out past 1500.

 

[Zak Smith]

Ok, so a little smaller than a nickel.

Mirage is really location and conditions-dependent. In this case, it actually wasn't that bad. I've had days where it was much worse at 600 than it was this time at 1600+.

-z

 

[Sylvan-Forge]

...

 

[hankdatank1362]

Um...

Do you have, like, an understudy? I can cook and clean, and pour one helluva martini!

Pleez?


You shot a 10"x10"get through 12x glass?

I'd need to be looking through the Hubble.

 

[eliphalet]

Impressive without a doubt.

 

[rangerruck]

WOW!!! the most amazing point of this, to me, is that the bullet still had that much speed going for it, that far downrange. Just goes to show you the excellent characteristics of the 6.5 at 140 grains...

 

[Zak Smith]

The high altitude and moderate temperature helped.

 

[birdbustr]

Range Drop Drop Velocity Mach Energy Time
1700(yds) -1107(in) -18.1(mils) 1225.9(ft/s) 1.097 463.7(ft/lbs) 2.801(s)

This is what my estimator says for drop at that range. I figured out that you must be using Lapua Scenar bullets since those are the only ones in 139gr.

 

[Zak Smith]

It's dropping about 0.1 mils every 5 yards, or about a foot every 10 yards... I think.

 

[birdbustr]

100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400 1500 1600
0 .5 1.1 1.8 2.6 3.4 4.3 5.3 6.4 7.5 8.7 10 11.3 12.8 14.5 16.2


Here's the breakdown

 

[Zak Smith]

Like I said, I ran it on JBM (and my software) after the fact.
http://www.eskimo.com/~jbm/calculations/traj/traj.html

 

[birdbustr]

I use the JBM also. I think it's about the best out there.

 

[crebralfix]

Consistency is key, which he was able to do. A spotter is essential, which he had. Finally, he had a gun and cartridge combination that can maintain velocity. Darn fine shooting!

As for the sight picture: he probably quartered the target, rather than look at a very small point on a very small target.

 

[Dr. Tad Hussein Winslow]

I'm not worth; I'm not worthy!!

 

[Shawnee]

Well, I'm pretty sure I can hit a nickel at 100yds. with my Contender pistol in .22 Hornet. But, at 1600+ yds I would have to shoot, run out and pick up the bullet and shoot it again, run and pick it up and shoot it again and so forth. But if you give me enough shots that way I bet I could eventually hit it.




Awesome shooting, Dude !

 

[Hutch]

Having just had my @$$ handed to me on a 1k yd range, I stand in awe. One day... you'll see... one day.

 

[KiltedClaymore]

For comparison, it's about like aiming on a nickel at 100 yards.

lets see some 100 yard nickle shooting! and zak, that kind of shooting scares me a little. in a good way.