Ballistic phone app?

I think the strelok pro app compensates for coriolis, I've never used the function tho.

Ballistic AE

Hornady has a free app that works pretty well

Ballistic ae compensates for spin and
Coriolis but I have found I need to true it up a little, I.e. tweak the muzzle velocity and bc to match my 1000yd dope

Trasol is another app that works pretty darn good, compensates for spin and coriolis and I have found it is more plug and play for me, at 1000 yds it requires less tweaking to match my dope, ymmv

OK I have to admit that the first thought I had was that a ballistic phone would make a great CCW.

I would think that for rifle shooting Coriolis corrections would be more intuitive than anything you might need an app for. About 40 years ago we "took that into account" based on the gun target line when shooting at 10 plus kilometers, though admittedly we did not worry so much about accuracy with an 98 pound HE 155mm round as you might with a bullet.

The effects will vary based on the direction you shoot in.

-kBob

I have found that the apps seems to overcorrect for spindrift and coriolis. . .for example at 630yds trasol tells me to add .3 mils left for spin and coriolis. with a 4mph wind from the 11 oclock i need another .1 mils

shooting a few weeks ago in that wind condition, i turned off spin and coriolis, held .1mils left and was hitting a 5" plate. I shot a PRS style match, max range 630 yds and kept spin and coriolis turned off and the only misses were due to my shooting (high due to poor position)

check out a podcast called "the everyday sniper" or go over to snipers hide and look it up, Frank discusses spin drift at length in one of the podcasts and recommends just turning it off. as mentioned above, it might be 1 moa or 2 moa at 1000yds, but a 2mph wind is more, so understand the wind and you shouldn't miss.

As a sniper in the army for 16 years (using 308 most of the time) TRUE spin drift and coreolis were never things that kept me up at night. Although my Horus ATRAG software has both in the program.

TRASOL.

joneb said:

I am not sure if spin drift and the coriolis effect are worth the worry, but in the northern hemisphere if the coriolis effect is said to cause the bullet to impact right of the target do to the counterclockwise rotation of the earth. And spin drift for a right hand twist can cause the bullet to drift to the
right, if this is true I would think a left twist barrel would be better in the northern hemisphere.

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Left hand twist is all the rage among the "cool kids" these days, seems it can't be a real precision rifle without one

The physics is sound, but I've just never seen solid data about the magnitude of these effects, especially in comparison to the real bugaboo -- wind drift. Since I don't have any place to shoot much longer than 400 yards these effects are a total non-issue for me.

wally said:

Left hand twist is all the rage among the "cool kids" these days, seems it can't be a real precision rifle without one
The physics is sound, but I've just never seen solid data about the magnitude of these effects, especially in comparison to the real bugaboo -- wind drift. Since I don't have any place to shoot much longer than 400 yards these effects are a total non-issue for me.

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I have heard the cool kids talk about one. the spin drift discussion with a left twist does not seem to interest me, my right twist 308 doesn't spin off target.

I have heard discussed how the recoil of a left twist with a right handed shooter feel a lot nicer, and a right twist for a lefty is potentially better due to how the rifle torques during the shot. I imagine to be measurable you would need to compare some light weight rifles with a big bullet twisting fast, like a 300wm with a 220g in a 1-9 or 1-10" twist

AB Mobile, Trasol, Strelok Pro.

I have it turned off, regularly shooting 1200-1600yrds.

It would appear these effects come into play at longer ranges than 400 yards.

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Duh!

Whiter Whites! Less filling, tastes Great!

Its all marketing hype until I see solid data on the magnitudes of these effects compared to say the effects of a 1 mph wind reading error. I'll likely have no use for such corrections unless they start tearing down all the houses in the flood plains to open up 1500+ yard shooting ranges

wally said:

Its all marketing hype until I see solid data on the magnitudes of these effects compared to say the effects of a 1 mph wind reading error. I'll likely have no use for such corrections unless they start tearing down all the houses in the flood plains to open up 1500+ yard shooting ranges

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I won't lie, I might try a left twist in my next barrel. . . .it can't hurt anything if you have a quality barrel and a quality smith, the bullet won't really know the difference. yes, wind is more important, but a left twist vs right twist barrel cost the same.

Strelok Pro does I believe. I've never bothered with it because I don't shoot at long enough distances that it really would have any real noticeable effect. I really like Strelok, took me awhile to really be comfortable with it but it's pretty impressive once you learn how to use it.

joneb said:

I found this of interest as well, https://loadoutroom.com/13415/reaper-tips-spin-drift-coriolis-effect/,
https://en.wikipedia.org/wiki/External_ballistics
It would seem the coriolis effect is less of a effect than spin drift and both are less of a effect on a bullets path than wind. But a left twist barrel does seem to to make more sense up north.

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Answers my question about spin drift, a bit less effect than a 1 MPH error in reading the wind. Seeing how around here the wind it almost never near constant over 1000 yards -- ever notice how different those large flags at car dealership lots can be moving over the span of the parking lot? I think its a non-issue in practical applications.

OTOH you comment about left hand twist making more sense up north seems a non-sequitur after largely dismissing the effect -- its a bias that can be nulled with zeroing wheres the wind is a essentially a random variation you have to "read" and guestimate a correction for.