Long Range Hunting Online Magazine Wind Drift
 Home LRH Store Forums Long Range Rifles Articles Reviews Video G7 Ballistics Calculator Rules & FAQ Register Search Today's Posts Mark Forums Read

# Wind Drift

#29
06-22-2012, 09:43 AM
 Silver Member Join Date: Jun 2012 Location: salt lake city, UT Posts: 131
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.
#30
06-22-2012, 10:00 AM
 Silver Member Join Date: Jun 2012 Location: salt lake city, UT Posts: 131
Re: Wind Drift

Quote:
 Originally Posted by WildRose 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.
#31
06-22-2012, 10:45 AM
 Gold Member Join Date: Jan 2003 Location: North Louisiana Posts: 503
Re: Wind Drift

__________________
United States Marines: Giving the enemies of America a chance to die for their cause since 1775!
#32
06-22-2012, 11:04 AM
 Gold Member Join Date: Jan 2003 Location: North Louisiana Posts: 503
Re: Wind Drift

__________________
United States Marines: Giving the enemies of America a chance to die for their cause since 1775!
#33
06-22-2012, 01:48 PM
 Silver Member Join Date: Jun 2012 Location: salt lake city, UT Posts: 131
Re: Wind Drift

Quote:
 Originally Posted by bjlooper 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............
#34
06-22-2012, 03:07 PM
 Platinum Member Join Date: Feb 2011 Location: Halfway between Lubbock and Dallas Posts: 3,726
Re: Wind Drift

Quote:
 Originally Posted by ajhardle 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.
#35
06-22-2012, 03:08 PM
 Platinum Member Join Date: Feb 2011 Location: Halfway between Lubbock and Dallas Posts: 3,726
Re: Wind Drift

Quote:
 Originally Posted by ajhardle ........ 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.

 Bookmarks

 Thread Tools Display Modes Linear Mode

 Similar Threads for: Wind Drift Thread Thread Starter Forum Replies Last Post pressman General Discussion 7 06-22-2012 10:08 AM northtoalaska Long Range Hunting & Shooting 2 04-30-2009 01:02 PM mnhunter2 Long Range Hunting & Shooting 9 10-21-2008 11:43 AM tikkaT3 General Discussion 6 02-17-2007 08:57 PM flopduster Rifles, Bullets, Barrels and Ballistics 8 02-05-2004 01:10 AM

 Current Poll Do you wear hearing protection while hunting? Usually do Usually do not No but I probably will in future
 Current Poll - 2 Do you have a high speed Internet connection? Yes, DSL, satellite, wireless or something else. - 89.18% No, only dialup right now. - 10.82% Total Votes: 3,051You may not vote on this poll.

All times are GMT -5. The time now is 11:16 PM.