At What Distance...

.30/06 FTW

.30/06 FTW

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Would the Coriolis effect actually have an effect on a bullet's flight path (or rather, where the target is)? Are military snipers trained to compensate for this when taking extreme distance shots? Would this have less of an effect on larger calibers/bullet weights? (I'm guessing not, since the effect of it would depend more on the bullet's speed and time in the air, and be negligible compared to the wind, right?) Finally, is there any reading material you guys know of that can explain this better?
 
I remember reading quite a long thread on snipers hide not long ago about this, and I think the general agreement (if you want to call it that), was that it does affect bullet flight but not enough to make a difference in POI. I believe at most it worked out to be about 3" at 1000 yrds.
 
Gyroscopic drift is the dominant non-wind drift factor. It can be observed when shooting rimfire with a high power scope. Rounds drop into the target from the upper left of the crosshair consistently.
 
A total side note here, I repair hemodialysis machines. The brand that I work on have very sensitive meters in them that measure flow rates exactly from running fluid through twisted tubes and measuring the strain on them from the coriolis effect.
 
"...in2..." What? Please use words. Geezuz.
The Coriolis Effect doesn't apply to rifles. Very big artillery, like Big Bertha of W. W. I, it did though. Time of flight thing for very big shells at extreme distances.
 
From what I understand, if you are shooting at 90 degrees to the spin of the earth, the corialis effect accounts for about 1" (not 1 MOA) of drift at 1000 yards. For all practical purposes it can be ignored as that amount of drift would be lost within the accuracy potential of your bullet impact, and scope adjustments are too course to correct for it.
 
sunray said:
"...in2..." What? Please use words. Geezuz.
The Coriolis Effect doesn't apply to rifles. Very big artillery, like Big Bertha of W. W. I, it did though. Time of flight thing for very big shells at extreme distances.
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... Not smart enough to figure out what in2 means? How about trolling?



The size of the round has nothing to do with it.
It's 100% related to time of flight.
 
coriolos - don't worry about it

wind - WORRY about it

Inconsistent shooting - likely the biggest error we have.

We have so many widgets and gidgets and we can now dial up a firing solution to account for everything including how many coffees we have BUT precious little of this matters even out to a mile.

Wind is the single largest variable that NO ballistics system can fully account for (except maybe you guys with the really big toys).

If LR shooting is what your goal is, get out there and SHOOT. You will quickly find that all this 'stuff' isn't worth the batteries it runs off. Learn to read the air.

Learn to shoot....

Jerry
 
Milner said:
I believe at most it worked out to be about 3" at 1000 yrds.
Click to expand...

Yeah, the ballistic software that I use says that it's about 3" at 1000 yards for most common cartridges.

It's all about time of flight, and 3" at 1000 yards CAN make a difference, depending on what you're trying to hit at that distance.

BTW, I don't play Call of Duty ;)
 
Jordan Smith said:
It's all about time of flight, and 3" at 1000 yards CAN make a difference, depending on what you're trying to hit at that distance.
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Precious few rifles are accurate enough to see that within the grouping of the rifle.

Even fewer shooters can dope conditions to that level.

How much drift does 2MPH make at that distance?

Get out there and shoot and you'll understand what I am getting at.

Jerry
 
i agree with all that say the effect is minimal, but it is a "known" variable that can be taken into consideration and its effects reduced or eliminated. for target shooters it is not as big a deal as there are sighters that allow you to compensate for it(either knowingly or not). when it comes down to first round hits at extreme distance, 1000 and beyond, why would a shooter not at least attempt to make a correction for it? in the same sense i do agree with those that have said that there are a lot of other variables at play, but it still comes back to the fact that it is a known factor that can be minimized or eliminated in order to put that round closer to the point of aim
 
This is why...

How accurate is your rifle under perfectly still, no mirage conditions at 1000yds with a cold bore?

Can you put a bullet on a MOA (10" plate) EVERYTIME under these perfect conditions using a field rest - anything you plan to hunt with or compete with.

One shot, one hit?

Now add in the normalness we call atmosphere - even if the winds are low are they the same over the entire journey? Can you tell?

How is the mirage?

How is the temp? Do you know what your ammo will do under the presented conditions?

Do you know what the rifle will do? how about the BULLET?

How about the shooter? Can this shooter dope conditions to within 1MPH over the span of 1000yds on demand? I bet 1MPH pushes you more then 3" and wind doesn't always go to the right....

There is a continued assumption that if a shooter and rifle can hit sub 1" at 200yds, he is good till the ends of the earth. maybe, but until he launches lead that far to test, he might be very surprised at what his real world accuracy at LR really is.

I have done ALOT of LR and extreme range shooting and enjoyed the company of a number of very good shooters and seen even more mega dollar rigs TRY and hit larger targets at these ranges.

Not many can come close to MOA at 1000yds under ideal conditions on a cold bore EVERYTIME. A handful can do this on any given Sunday.

The affect of coriolis is lost in the noise which is the process of shooting.

And yes, LR hunters take sighter shots too.....

YMMV.

Jerry
 
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