Long Range Hunting Online Magazine


Go Back   Long Range Hunting Online Magazine > Hunting > Long Range Hunting & Shooting

Long Range Hunting & Shooting Nightforce Optics


Reply

Wind Drift

 
LinkBack Thread Tools Display Modes
  #29  
Old 06-22-2012, 08:43 AM
Silver Member
 
Join Date: Jun 2012
Location: salt lake city, UT
Posts: 132
Re: Wind Drift

okay, your right that a .308 produces more energy than a .243. But your not comparing apples to apples. The .208 gr Amax is a great long range bullet with low bearing surface and a secant nosecone. hornady's 105 gr. is not bad, but look at the shape. long bearing surface, shorter tangent nosecone can't compete. Run it one more time with a berger 105 hybrid. It's closer in form to the 208. Even with the reduced energy, I came up with 68" wind drift. And remember, with the reduced volume in the bore, the .243 will get huge gains from longer barrel and the .308 can gain some extra velocity, but not much.
I'm glad i took the time to check. I would have thought the energy of the .308 would have made it better.
Reply With Quote
  #30  
Old 06-22-2012, 09:00 AM
Silver Member
 
Join Date: Jun 2012
Location: salt lake city, UT
Posts: 132
Re: Wind Drift

Quote:
Originally Posted by WildRose View Post
You can't push the 208gr to 3000fps in a .308 case.

At 2,500 which is possible however.

E-208 Muzzle = 2880 1,000yds 879 WD=75"

Ballistics Calculator v1.0

.243: 105gr-3,100fps
Em-2240, 1,000yds=517 WD=76.7

Ballistics Calculator v1.0

When we stick to the realm of reality once again, same size case, heavier, higher BC bullett wins out again both energy wise, and wind drift wise.



Again, there are limits to how fast you can push any bullet out of any given case.
........ I know what your trying to say, higher b.c. wins, but it's a little misleading. Let's just say "The heaviest bullet for a given caliber wins, if the shape is similar or better." Key word is shape not heaviest. No-one can argue that.
Reply With Quote
  #31  
Old 06-22-2012, 09:45 AM
Gold Member
 
Join Date: Jan 2003
Location: North Louisiana
Posts: 575
Re: Wind Drift

The Rifleman's Journal: Cartridges: The .308 Heavy Bullet Conundrum
__________________
United States Marines: Giving the enemies of America a chance to die for their cause since 1775!
Reply With Quote
  #32  
Old 06-22-2012, 10:04 AM
Gold Member
 
Join Date: Jan 2003
Location: North Louisiana
Posts: 575
Re: Wind Drift

http://riflemansjournal.blogspot.com/2009/06/long-range-competitor-looks-at-heavy.html
__________________
United States Marines: Giving the enemies of America a chance to die for their cause since 1775!
Reply With Quote
  #33  
Old 06-22-2012, 12:48 PM
Silver Member
 
Join Date: Jun 2012
Location: salt lake city, UT
Posts: 132
Re: Wind Drift

Quote:
Originally Posted by bjlooper View Post
I have read more than a few post on this fourm as well as others. That imply that by going to a heaver bullet or to a larger caliber that you will get less wind drift.
Am I mistaken I thought that the weight or the caliber of the bullet had nothing to do with wind drift. The only thing that matters is time of flight. Which means that velocity and balistic coefficient, are the main factors effecting wind drift.
example of this is if you have two bullets Shoot at 3000 fps and are traveling in a 90 degree ten mph cross wind. bullet A is .243 cal 80 gr with a BC of .534 and Bullet B is a .243 cal 105 gr with a BC of .534. They will have the same wind drift and the same drop and the same time of flight at any given range.

So if I'm wrong will some one please teach me what is correct.

DR B
This is the origin of this thread. Does going (question #1) to a heavier bullet or (question #2) to a larger caliber decrease wind drift? (Answer#1) A heavier bullet will be advantageous at longer ranges, because of a higher b.c. provided the form factor is the same (form factor=shape). But going to a larger caliber? (Answer#2)No. Not by itself.form You would have to increase powder capacity accordingly............
Reply With Quote
  #34  
Old 06-22-2012, 02:07 PM
Platinum Member
 
Join Date: Feb 2011
Location: Halfway between Lubbock and Dallas
Posts: 4,566
Re: Wind Drift

Quote:
Originally Posted by ajhardle View Post
okay, your right that a .308 produces more energy than a .243. But your not comparing apples to apples. The .208 gr Amax is a great long range bullet with low bearing surface and a secant nosecone. hornady's 105 gr. is not bad, but look at the shape. long bearing surface, shorter tangent nosecone can't compete. Run it one more time with a berger 105 hybrid. It's closer in form to the 208. Even with the reduced energy, I came up with 68" wind drift. And remember, with the reduced volume in the bore, the .243 will get huge gains from longer barrel and the .308 can gain some extra velocity, but not much.
I'm glad i took the time to check. I would have thought the energy of the .308 would have made it better.
Well then once again you get into the problem with a non apples to apples comparison.

We can use the Berger 210g 30 cal hunting VLD to compare to the berger .243 VLD and we'll get similar results to comparing the AMAX's for each.

Again the higher BC bullet wins out because if flies better, and resists wind effects better than the lower BC bullet.
__________________
Without the First and Second Amendments the rest of The Constitution is Meaningless.
Reply With Quote
  #35  
Old 06-22-2012, 02:08 PM
Platinum Member
 
Join Date: Feb 2011
Location: Halfway between Lubbock and Dallas
Posts: 4,566
Re: Wind Drift

Quote:
Originally Posted by ajhardle View Post
........ I know what your trying to say, higher b.c. wins, but it's a little misleading. Let's just say "The heaviest bullet for a given caliber wins, if the shape is similar or better." Key word is shape not heaviest. No-one can argue that.
The key word is Basllisic Coefficient which is what you were discounting in the two posts I first replied to.

The weight of the projectile is one of the factors in computing BC.
__________________
Without the First and Second Amendments the rest of The Constitution is Meaningless.
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes


Similar Threads for: Wind Drift
Thread Thread Starter Forum Replies Last Post
wind drift pressman General Discussion 7 06-22-2012 09:08 AM
wind drift data??? northtoalaska Long Range Hunting & Shooting 2 04-30-2009 12:02 PM
Wind drift? mnhunter2 Long Range Hunting & Shooting 9 10-21-2008 10:43 AM
Wind Drift tikkaT3 General Discussion 6 02-17-2007 08:57 PM
wind drift???? flopduster Rifles, Bullets, Barrels and Ballistics 8 02-05-2004 01:10 AM

Current Poll
Where in the US do you live?
West of the Mississippi River - 60.83%
899 Votes
East of the Mississippi River - 36.87%
545 Votes
On the Mississippi River on a houseboat - 2.30%
34 Votes
Total Votes: 1,478
You may not vote on this poll.

All times are GMT -5. The time now is 04:54 PM.


Powered by vBulletin ©2000 - 2014, Jelsoft Enterprises Ltd.
Content Management Powered by vBadvanced CMPS
All content ©2010-2014 Long Range Hunting, LLC