Simple ballistics question

M

Migs

Guest
Friends:

My .308 using 155gr. Nosler boat tail Competition bullets is sighted in at 200 yards. Where will the bullet hit at 50yds., 100 yds. and 250 yds.? What is my muzzle velocity?

Can you suggest an application that would answer ballistic questions like this?

Thanks amigos,

Migs
 
Hi Jerry:

At first I thought, there must be a velocity for this to happen *, but then I realized that there may be velocities higher than that minimum that would still have the same POI at 200yds **, so you are absolutely right. Since I have not chronometered the load I have no idea. I am now left with a nice project for the weekend at the range. (thank you for kick starting my insight!)

As for the software, I will look at it right now!

Many thanks!

Migs

* (for the bullet to get to the target)
** (flatter parabolas)
 
The only means of determining the muzzle velocity of a particular load in a particular rifle is to chronograph that load in that rifle. A reasonably good chronograph is an inexpensive way to learn a whole lot about your loads. If you're shooting short range BR muzzle velocity is a minor consideration, but for most other types of shooting it can be very important.

Ballistics tables can get you close to the trajectory of a given bullet at a given velocity, but elevation and temperature amongst other things can effect trajectory.
 
Hi Larry:

I have a chronometer at the range. I was wondering if there was an "easy way" to determine the value, but I guess it will make more sense to go through the steps to get to know my load. I also bought the program, which I expect will teach me some things too.

I shoot at 10,826 ft of altitude and our air temperature is typically 75 Fahrenheit. I would guess that bullets travel a bit faster up here due to the rarefied atmosphere, but how much faster than at sea level?

That should prove fun to put in the program and see what effects altitude has.

Migs
 
You must log in or register to reply here.
Back
Top