BC question???
#1
Thread Starter
Join Date: Jul 2004
Location: Kansas
Posts: 178
BC question???
Can anyone help me out and find me the Ballistic Coefficient of a Federal Preimium .243 100gr Sierra Gameking Boatail. I know this isnt important in the equation but the average velocity is stated at 2960.
Federal doesnt have it posted anywhere, and the box doesnt either. I need it to run the ballistic program to figure out long range trajectory.
Thanks.
Chris
Federal doesnt have it posted anywhere, and the box doesnt either. I need it to run the ballistic program to figure out long range trajectory.
Thanks.
Chris
#3
Giant Nontypical
Join Date: Feb 2003
Location: fort mcmurray alberta canada
Posts: 5,667
RE: BC question???
Of course your trajectory calculation will not be accurate without the actualvelocity that the load produces in your gun which can easily differ by over 100fps from manufacturers claims,or without a precise measurement of your crosshairs over the center of the bore.Even then it could be out several inches at 500 yards.
#4
Giant Nontypical
Join Date: Feb 2003
Location: fort mcmurray alberta canada
Posts: 5,667
RE: BC question???
Actually I prefer to take all the guesswork out by actually shooting at 100,200,300,400 and 500 yards.The tables and calculations have been out by several inches in some cases.
#5
RE: BC question???
I have had pretty good luck with the Exbal program - which allows you to program in things like altitude, height of scope above the bore, barometric pressure, etc. The only thing from making it a more exact science is the "truth in advertising" factor when it comes to ballistic coefficients. It seems like Sierra tends to overstate theirs a little . . .
Got to actually shoot the bullet at distance.
Got to actually shoot the bullet at distance.
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