Rifle Scopes Ballistic Calculators?

[ROLEXrifleman]

Are there any freebie calculators out there that allow you to input the MOA value of your base as well?

Trying to run the datat for the following


.308
190gr
.533 B/C
@2900fps
65 degrees
0 compensation for altitude
28 MOA mount
2" scope above bore
0 for sight in distance


if someone can run it, or better yet let me knoiw where a calculator can be found I would appreciate it.

TIA

 

[ROLEXrifleman]

Re: Ballistic Calculators?

My nephew is getting into shooting and I'm letting him set up one of my rifles to whatever liking he wants. He's a bookworm and wants to see how close to real shooting he can get with his calculations on paper. I think he is going after, based on a 0 distance zero, how much elevation needs to be adjusted to get to zero at x distance. I guess it's hard to explain when your typing but I kinda get the jist of what he is after.

I know he can do what he's looking for on paper, but with thousands of diffrent loads he would spend all his time crunching numbers.

 

[dvldg3166]

Re: Ballistic Calculators?

If you have a IPhone ,you can buy Ballistics Fte for $20. It is a very good program.

 

[tmshot]

Re: Ballistic Calculators?

iStrelok (iphone, ipod touch) is FREE, a simple ballistics calculator,but it is not as good as ballistics.
Free is good and it may meet your needs.

 

[sniperaviator]

Re: Ballistic Calculators?

The best explanation of how optics interact with shooting and what you need to know that I have ever encountered is here:
http://demigodllc.com/articles/practical-long-range-rifle-shooting-optics/

BTW, because the scope sits about 1.5" above the barrel, there is no such thing as a zero distance zero. Also, a 20moa scope rail just adds to the scopes UP elevation moa adjustment capability, it doesn't really affect the ballistic trajectory (except for it's contribution to the height of the scope above the barrel, which is slight). Just use 100 yard zero for starters.

The best online, free ballistics program can be found here:
http://www.jbmballistics.com/cgi-bin/jbmtraj-5.1.cgi

 

[ROLEXrifleman]

Re: Ballistic Calculators?

I may just have to tell him to read everything I have in the past and then when he has a better understanding I can teach him. I don't see him often enough to show him. Wish he didnt live so far away.

 

[leadbullet]

Re: Ballistic Calculators?

I have the ballistic FTE for my iphone and it is dead on once I figured out how to use it properly, the "HUD" functionis very usefull when going to different ranges around the state.

 

[neeley205]

Re: Ballistic Calculators?

I use the "shooter" program for android. Also very good. If you go to the Berger website, they offer suggestions for the ballistics calculators they have found useful.

 

[sobrbiker883]

Re: Ballistic Calculators?

2" sight above bore and "0" sight in distance will not compute......
Trajectory (given a level rifle) will start at -2" and drop from there, but you cna never "zero" at the muzzle.

 

[ROLEXrifleman]

Re: Ballistic Calculators?

I spoke to my nephew at length yesterday and got a better understanding of what he is looking for. ver basic but makes sense.

The 0 yard zero isnt what I thought. From what it sounds like he is just trying to plot trajectory of a given projectile start at 0 yards measured out to 1000 yards, simple balistic calculator stuff. He is then, on the same graph paper, plotting the line of sight of a scope with an "X" MOA base to see how it matches up against the trajectory of the projectile. The 2" over bore would then concieve as soberbiker said, 2" above x impact at o yards. I'm gonna try and plot what he explained to me later and scan it fo ryou guys. I kinda get what he says, and think there has to be a program outthere like it just not a freebie.

 

[brand692]

Re: Ballistic Calculators?

Rolex,

I see what you are trying to do with the 28 MOA base. I'm not sure why he would want to do that, because essentially you negate the base with the scope when you zero it.

There isn't a ballistic calc that will figure that out for you, simply for that reason. No one mechanically zeros a scope with a 0 MOA base to be 2 inches high on a 0 yard Zero and then puts that same scope on a 28 MOA base without changing it, and creates dope chart from that. In reality, we put our scope on the 28MOA base and then zero at the yardage most beneficially to our application. All the 28 MOA does is cheats the scope from having that 28MOA going down and puts it on the going "Up" side. Essentially it sets the the Erector Tube inside the scope 28MOA lower than mechanical zero so that you have an extra 28MOA of up.

What I can do for you, is run the numbers with different zeros ie 0yd, 100yd, 200yd, 300y. I would also need relative humidity and barometric pressure otherwise I can't figure in the atmopheric conditions. Ballistic FTE either makes you put it all in or none of it.

I'll be more than happy to run whatever you want. It just so happens that Ballistic FTE has the variable BCs for the 190 SMK already built in, so as it slows down, the BC goes down, and it will calculate it for you.

Let me know if I can help.

ETA: Rereading this, I sound confusing as hell. Sorry.