wind bucking

[g n brezinski]

given a 6 mm bullet that is 65 to 80 grain in weight driven faster then a ppc can be will you keep the accuacity of a bullet at the ppc speeds.a br case is said to give you 150 to 300 fps over the ppc.
the br type in the hands of some real good shooters in the 600 yard to 1000 yards is shooting some amazing groups.
any thoughts why this can not be applied to the short range shooting?
gary.

 

[alinwa]

given a 6 mm bullet that is 65 to 80 grain in weight driven faster then a ppc can be will you keep the accuacity of a bullet at the ppc speeds.a br case is said to give you 150 to 300 fps over the ppc.
the br type in the hands of some real good shooters in the 600 yard to 1000 yards is shooting some amazing groups.
any thoughts why this can not be applied to the short range shooting?
gary.

I think you're saying "the faster bullet should buck wind better"

perhaps because "it's in the wind for less time."

The answer is "NO"....at least not enough to ever use.

Bullets "drift" based on the rate at which they're slowing down. They are not "blown over by the wind."

Example test you can do yourself......

TEST #1-Use a ballistics program to run the numbers....A 65gr PPC bullet will take just under 1 second to fly 600yds. 1 second for the wind to blow on it. in a 10mph wind it will drift more that 4 feet from center.

TEST #2- Climb up on your house roof and drop a bullet. In the same time of just under a second it'll fall about 15ft. Notice that it WILL NOT be blown over 4 feet.


It just ain't about time in the wind......

 

[Boyd Allen]

There are two variables that determine differences in wind drift (all other things being equal), muzzle velocity, and ballistic coefficient. Plug these into a reliable program and it will predict wind drift. What it will not predict is small differences in inherent accuracy. There are things called matches that are the best means that we have for that. Bart Sauter is doing some experimenting (shooting in registered competition) with a 6.5 Grendel necked down to 6mm and it shoulder fire formed to 40 degrees, using his own 80 gr. BT bullets. I believe that the thought is to gain some advantage at 200, without loosing it at 100. I love the economy of letting someone else do an experiment that I am interested in. Given his demonstrated skill, we should have an answer in relatively short order.