Technical aspects of a 5000 yard shot

[Hoffer]

I posted this on another forum ... figured I should post it here too

Going thru some numbers on a theoretical rifle at 5000 yards using AB app
Specs
375 bullet / 400 gr CE lazer @ 3500 fps could be 375/416, 375/50
Density altitude 0
Wind 0

337.4 MOA
11.8 sec flight time
Altitude at max arc 1400 ft
Standard rifle prone w/ bipod shoulder to bipod length 24"
0 moa rifle (theoretical)

.001" movement at either shoulder or bipod or combination of both during firing is 7.5" deviation at 5000 yards (1 hair is .003")
2 fps difference in load (3502 fps) 337.0 moa .4 moa off = 20.94"
5 fps difference in load (3505 fps) 336.4 moa 1.0 moa off = 52.35"
Combination of .001 shooter deviation and 5fps muzzle velocity 59.85" off

Now throw in a true 1/4 moa rifle and shooting mat that moves around - easily double that.

Then throw in some wind and wind reading from ground level to 1400 ft agl

There's always that pesky dispersion problem too

Don't forget the bigger the gun, the harder it is to handle and shoot

Sounds simple

[Kingair001]

Sounds simple . . .

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[LynnJr]

I am ready to take a shot at 4000

[stevebla]

All day long if I do my part.

[Scottie15]

Altitude at max arc 1400 ft

Ouch.... that could monkey up your wind calls.

[Apollo]

I am ready to take a shot at 4000

I'll bring my 308...

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[Hoffer]

I'll bring my 308...

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And 2000 rounds

[Apollo]

And 2000 rounds

Don't forget the 12' x 20' target.

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[71MUSTY]

Don't forget to pray.

[Apollo]

Don't forget to pray.

I think I could get a prayer or two in during the 20 second flight time.

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[oktavist]

You forgot to calculate for coriolis effect of the earths spin. This will be dependent on the direction you're shooting in.

[Hoffer]

You forgot to calculate for coriolis effect of the earths spin. This will be dependent on the direction you're shooting in.

DOF was not specified but Spin drift / Coriolis was in the calculation

[bridgeport]

Just for comparison sake, here is what is considered to be one of the most accurate tank rounds in existence today, I lifted this quote from another site so here it is.
(For example the Rheinmetall 120mm HE round has shown a maximum 9cm vertical dispersion and a 34 cm lateral one at 2,000 metres for a 5-round group).

So there you have it, 2000m 5 rounds at 9cm vert and 34 lateral. From what I gather, most modern targeting systems (on tanks at least) will not even input a 5000 meter shot.

Question: What is the best documented rifle shot (.50 cal or under) 5 or 10 round group anybody here can show that was shot at 2000 meters or yards, or beyond?

[focus]

Question: What is the best documented rifle shot (.50 cal or under) 5 or 10 round group anybody here can show that was shot at 2000 meters or yards, or beyond?

There is anecdotal evidence on the URSA website of 2000y 5-7 shot groups less than 100 cm. No one has had a 10 shot group on the 100 cm gong yet. I know the actual groups may have been less than 100 cm; but, in URSA accuracy matters.

Cheers,

[bridgeport]

There is anecdotal evidence on the URSA website of 2000y 5-7 shot groups less than 100 cm. No one has had a 10 shot group on the 100 cm gong yet. I know the actual groups may have been less than 100 cm; but, in URSA accuracy matters.

Cheers,

Seriously, if accuracy matters in the URSA, they ought to have something more than "Anecdotal" evidence. Documentation matters.