Wind Drift?

rcmark · November 14, 2015, 09:58 PM

Quote from this link:
http://gunsmagazine.com/varmint-rifle-trends/

"There’s also a fairly common belief that the .17 Hornady Magnum Rimfire’s bullets drift more in the wind than the heavier bullets of the .22 Magnum, but this simply isn’t true, as anybody who shoots both cartridges much will discover. In fact most .22 Magnum bullets drift as much as .22 Long Rifle bullets, and .17 HMR bullets drift about half as much."

So would the .17 hornet have less drift than the .17 hmr?

Anyone seen a 'wind drift / cal. chart'?

emcon5 · November 14, 2015, 10:35 PM

Some of the Hornady rimfire bullets are in the JBM bullet database, you can run the numbers and see.

http://www.jbmballistics.com/cgi-bin/jbmtraj-5.1.cgi

Jimro · November 15, 2015, 12:56 PM

Wind drift has to do with velocity, BC, and distance interacting with a crosswind. So it is entirely possible that a 22 magnum would have less wind drift at shorter ranges because of velocity and bullet momentum, but more wind drift at longer ranges where the fatter bullet has slowed more than the 17 cal bullet.

Between Berger and Sierra neither can agree if crosswinds push the bullet nose upwind or downwind. Both have ballistic models that work though, so the mechanics are pretty irrelevant from a shooter perspective.

Jimro

**JohnKSa** · November 15, 2015, 04:11 PM

Moved to Rifles.

Bongo Boy · November 16, 2015, 04:18 PM

...and the bullet will drift even the complete absence of any cross flow at all. That affect is increased as the angle between the axis of bullet rotation and the velocity vector of the bullet increases (a function of flight time), and decreased (not necessarily in equal measure) as the bullet airspeed decreases (also a function of flight time).

rcmark · December 4, 2015, 02:43 PM

New info:

Ammo Source: Hornady ballistics calculator

Wind Drift
10 mph at 90°
300 yards

Hornady 17 HMR V-Max 17GR. 39.1

Hornady 17 Hornet 25 gr HP 15.1

Hornady 17 Hornet 20 gr V-MAX 13.8

Hornady 17 Hornet 15 gr V-MAX 24.5

Hornady .223 55 Grain V-Max 10.9

Hornady .223 53 Grain V-Max Superformance 8.6

Federal Gold Medal 223 Rem 69 gr. MatchKing 10.3

Ruger 204 Hornady 32 gr V-Max Superformance 10.4

Ruger 204 Hornady 40 gr V-Max Superformance 7.9

Gunplummer · December 4, 2015, 05:02 PM

Bongoboy is correct. He is describing what we used to call "Bullet whip". That is why at different yardage your point of impact varies. The Marines used a "Dope sheet" to compensate.

November 14, 2015, 09:58 PM	#1
rcmark Member Join Date: August 31, 2015 Location: Ft Mohave, AZ Posts: 69	Wind Drift? Quote from this link: http://gunsmagazine.com/varmint-rifle-trends/ "There’s also a fairly common belief that the .17 Hornady Magnum Rimfire’s bullets drift more in the wind than the heavier bullets of the .22 Magnum, but this simply isn’t true, as anybody who shoots both cartridges much will discover. In fact most .22 Magnum bullets drift as much as .22 Long Rifle bullets, and .17 HMR bullets drift about half as much." So would the .17 hornet have less drift than the .17 hmr? Anyone seen a 'wind drift / cal. chart'?

November 15, 2015, 12:56 PM	#3
Jimro Senior Member Join Date: October 18, 2006 Posts: 7,097	Wind drift has to do with velocity, BC, and distance interacting with a crosswind. So it is entirely possible that a 22 magnum would have less wind drift at shorter ranges because of velocity and bullet momentum, but more wind drift at longer ranges where the fatter bullet has slowed more than the 17 cal bullet. Between Berger and Sierra neither can agree if crosswinds push the bullet nose upwind or downwind. Both have ballistic models that work though, so the mechanics are pretty irrelevant from a shooter perspective. Jimro __________________ Machine guns are awesome until you have to carry one.

November 15, 2015, 04:11 PM	#4
JohnKSa Staff Join Date: February 12, 2001 Location: DFW Area Posts: 24,992	Moved to Rifles. __________________ Do you know about the TEXAS State Rifle Association?

November 16, 2015, 04:18 PM	#5
Bongo Boy Senior Member Join Date: December 18, 2008 Location: Colo Spgs CO Posts: 517	...and the bullet will drift even the complete absence of any cross flow at all. That affect is increased as the angle between the axis of bullet rotation and the velocity vector of the bullet increases (a function of flight time), and decreased (not necessarily in equal measure) as the bullet airspeed decreases (also a function of flight time). __________________ NRA Benefactor Member “If I had to live my life again, I'd make the same mistakes, only sooner.” T Bankhead "I think only the authorities should have weapons." The New American Electorate

November 14, 2015, 10:35 PM	#2
emcon5 Senior Member Join Date: July 10, 1999 Location: High Desert NV Posts: 2,850	Some of the Hornady rimfire bullets are in the JBM bullet database, you can run the numbers and see. http://www.jbmballistics.com/cgi-bin/jbmtraj-5.1.cgi

December 4, 2015, 02:43 PM	#6
rcmark Member Join Date: August 31, 2015 Location: Ft Mohave, AZ Posts: 69	New info: Ammo Source: Hornady ballistics calculator Wind Drift 10 mph at 90° 300 yards Hornady 17 HMR V-Max 17GR. 39.1 Hornady 17 Hornet 25 gr HP 15.1 Hornady 17 Hornet 20 gr V-MAX 13.8 Hornady 17 Hornet 15 gr V-MAX 24.5 Hornady .223 55 Grain V-Max 10.9 Hornady .223 53 Grain V-Max Superformance 8.6 Federal Gold Medal 223 Rem 69 gr. MatchKing 10.3 Ruger 204 Hornady 32 gr V-Max Superformance 10.4 Ruger 204 Hornady 40 gr V-Max Superformance 7.9

December 4, 2015, 05:02 PM	#7
Gunplummer Senior Member Join Date: March 11, 2010 Location: South East Pa. Posts: 3,364	Bongoboy is correct. He is describing what we used to call "Bullet whip". That is why at different yardage your point of impact varies. The Marines used a "Dope sheet" to compensate.