Re: Question about wind drift?
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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