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New to me regarding BC

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https://forums.accuratereloading.com/eve/forums/a/tpc/f/4711043/m/9271024071

23 January 2012, 22:12
jsl3170
New to me regarding BC
I was looking at this and noticed:

http://www.sierrabullets.com/i...um=3000&bullettype=0

I did not realize the BC of a bullet can change as it flies at different speeds. It would appear there is an ideal velocity window here.

Somethin' new ever'y day.
23 January 2012, 22:36
PoppaW
A good reason to figure out drop then check by actual shooting. Seems that bullet likes it faster than 1800fps.


WOODY
Everyone is allowed an opinion, even if its wrong.
23 January 2012, 23:40
Gerard
Depending on the shape of the bullet, as speed drops away, the BC can go up, down or remain about the same.
25 January 2012, 23:26
Max Trauma
G1 bc are for a bullet that is 3 calibers in lenth with a 2 caliber ogival radius. if this shape bullet is used its bc will remain the same but most modern bullets are not of this shape so the bc reflects the ave drag of the projectile over distance. g7 bc calculations will give you a better idea of traj with a vld style bullet but the best way to know your traj is to go out and ladder shoot at distance increments of 100 yards to learn where you bullet will hit. also as barometric pressure humdity ect changes so with the bc.
go to www.frfrogspad.com and there is some good data on bc in a short consise format. I have not checked but I suspect gerard may have some good info on his website
26 January 2012, 19:17
416Tanzan
This is the big bore forum, where shooting is rarely beyond 300 yards. Up to 400-500 yards there is just not that much difference in BC's to make any practical difference in hunting/shooting.

My recommendation is to find a bullet with about a .350-.400 BC and go out and get to know the rifle and the loads out to 400 yards. If CEB comes out with .450-.500BC Raptors, so much the better. In Africa you will not need that for dangerous game beyond 200 yards (and 200 only under 'perfect' conditions), nor for plains game beyond 300.


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"A well-rounded hunting battery might include:
500 AccRel Nyati, 416 Rigby or 416 Ruger, 375Ruger or 338WM, 308 or 270, 243, 223" --
Conserving creation, hunting the harvest.
26 January 2012, 21:02
zimbabwe
I have yet to see ANY animal that can read and understand these charts.


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DRSS
27 January 2012, 08:06
Gerard
That is why we read and understand the charts, so that we can do a better, reasoned job. It is what sets us apart from the animals.