Bullet drop at 600 yards...

M

Mikey

New member
I need some help from someone with ballistics software or the ability to calculate bullet drop based on the following criteria:

.243 Win - 80 gr PSP - ballistic coefficient .255 - started at 3350 fps - rifle sighted dead on at 300 yards...

What's the hold over for a center hit at 600 yards??

Reason? - I am going to enter a 4 gun match this weekend. My AR is already set up for the pop-ups, my pistol is ready, my shotgun is adequate and the rifle mentioned above is a 1/2 minute performer at 300 yards (the longest distance I have available to me) but the course requires 1 series of shots at a B-27 silhouette at 600 yards. HELP...

Mikey
 
What do you put in to the Ballistic Coefficient:? For instance, your basic M193 .223 55gr. bullet? Do they have that on the box the ammo comes in, or do you have to just know that info?
 
Up hill, both ways

A quality reloading manual will have all that good stuff in the back of the book. This is what granddaddy used before the hand-held calculator and the Athlon chip.

Rick
 
Mikey, If you don't mind, would you post the holdover you got from the online calculator(s) for the bullet and stated conditions in your first post? Being basically lazy, I didn't want to go to each site and plug in the factors. I would like to cross check a ballistics calculator I have on my PC. TIA
 
I couldn't get the second one posted to connect but the first one gave me 64.5 inches (sight at 1.5 above bore line) - what do you get?

Mikey
 
I get 66.2" using a graduated ballistic coefficient since the BC tends to decrease from its value at the muzzle velocity as it travels downrange and the vel bleeds off. Using a constant BC, I get 65.8". With a difference of less than 2 inches at 600 yards, I'd say both programs are in agreement considering the other variables that also affect the trajectory (temp, elev., etc.).
 
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