Long Range Hunting Online Magazine Question about wind drift?
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#1
12-10-2006, 12:02 AM
 Bronze Member Join Date: Dec 2003 Location: Springfield, VA Posts: 40

I have always been of the thinking that at longer ranges the bigger slower bullets though slower and dropping more did a better job at bucking the wind.....I just read something on another forum where a senior member said that slow heavy bullets always drift more cause they are "in the wind longer" and have more chance to drift?????

This is opposite of how I have always thought?
#2
12-10-2006, 02:36 AM
 Platinum Member Join Date: Feb 2005 Location: Nevada Posts: 2,767

The less time a bullet takes to hit home the less it will be deflected by the wind. This is true. When looking for bullets that will be less affected by the wind, regardless of caliber and bullet weight, you want to look at the BC (Ballistic Coefficient) of the bullet. The higher the BC the better the bullet resists the wind, the less velocity it looses, the faster it will get to the target.

Example: Both at sea level, and same muzzle Velocity = 2700 ft/sc, Wind= 5 mph

30-06 Fed Pro-Hunter <font color="blue">BC=0.249 </font> Wgt=180 gr 1000 yds deflected 110.74”
243 Rem Ext Range <font color="red">BC=0.403 </font> Wgt=105 gr 1000 yrds deflected 63.38”

Velocity of both bullets at 1000 yds is:
30-06= 824 ft/sec
243= 1080 ft/sec

The bullet with BC = 0.403 (105 gr.) whipped the other one by a large margin.

If both bullets had had the same BC in spite of the difference in weight, the results would have been identical up to this point.

Now, the energy for our example is identical for both bullets... 30-06=271 ft-lb. 243=272 ft-lb.

I hope this shows how important BC is in shooting long range. When you get high BC together with high speed, now you're cooking! [img]/ubbthreads/images/graemlins/smile.gif[/img]
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Our Lord Jesus said that as it was in the days of Noah and
also as it was in the days of Lot so it shall be in the days...
It's happening again!!! God sent to us His prophet, and His Word
to this generation and we once more are rejecting it as was prophesied!!!

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#3
12-10-2006, 04:28 AM
 Platinum Member Join Date: Dec 2001 Location: Mukilteo, WA Posts: 1,090

To clarify, TOF is only one factor. BC is a bigger factor. A higher BC bullet can have less drift even with a longer time of flight. The wind has less effect on the high BC bullet over the time it's flying. In sort of the same way the air has less effect on it longitudinally (it doesn't slow the bullet down as fast--the high BC bullet keeps its velocity better over the same TOF as well).

The "senior member on another forum" is incorrect.
#4
12-10-2006, 08:35 PM
 Platinum Member Join Date: Feb 2005 Location: Nevada Posts: 2,767

Tha's correct!
__________________
-----------------------------

-----------------------------
HEBREWS 13:8
Jesus Christ the same yesterday, and to day, and for ever.

Our Lord Jesus said that as it was in the days of Noah and
also as it was in the days of Lot so it shall be in the days...
It's happening again!!! God sent to us His prophet, and His Word
to this generation and we once more are rejecting it as was prophesied!!!

---> As promised, God Sent His Prophet to us!
#5
12-11-2006, 09:44 AM
 SPONSOR Join Date: Dec 2004 Location: El Reno, OK Posts: 1,930

[ QUOTE ]
The "senior member on another forum" is incorrect.

[/ QUOTE ]

Yes he is. I'd bet he is kinda like I was about 2-3 years ago. Those superfast light bullets would work for 1000 yd stuff in my head. Then I tried them. Boy was I wrong!!!! You think you know it all and then you listen to someone and find out otherwise!!!
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Third Generation Shooting Supply
"Products for shooters, by shooters"
405-229-0942
Monday-Friday 8:30-5:30 CST
#6
12-12-2006, 04:40 PM
 Bronze Member Join Date: Dec 2003 Location: Springfield, VA Posts: 40

Thanks for the reassurance.....I didn't mean to sound like a rookie, cause I am really not, but just wanted to make sure I wasn't crazy.....

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