Range Report scope mil lines for max range holdover distances

[longeye51]

I have a scope on a rifle that I shoot in excess of 1000 yards. I know the muzzle velocity fps. I need a calculation that will give me the best zero distance so that I can pickup the gun up and shoot the broadest range of distance just using holdover. The reticle is tacticle mil. Does anyone have such a calculation, or that can tell me how to accomplish my goal? My ballistics program will give me the yardage at zero and above, but not below the zero distance.

 

[Topstrap]

Re: scope mil lines for max range holdover distances

If you enter all your info into JBM ballistics and played a bit with different zero settings and checked the rise and fall at each distance compared to the size of your targets you could figure out the best zero distance for your particular setup. You can move your zero distance in the program to see the changes on the chart. Set it to show distances at smaller amounts such as 10 yard intervals to give you better information.

http://www.jbmballistics.com/cgi-bin/jbmtraj_simp-5.1.cgi

Topstrap

 

[Graham]

Re: scope mil lines for max range holdover distances

Based on what you said: Look at how many Mil dots are above the crosshair; then zero using the center of the uppermost Mil dot.

 

[longeye51]

Re: scope mil lines for max range holdover distances

Thanks, I just tried the JBM program but it gives MOA output. I am trying to get the mil output for the mil reticle, e.g., 700 yd zero, top mil line in reticle is 100 yds and bottom mil line in reticle is 1200 yds. If I can figure out how to do that, I could then just pick the gun up and know what each mil line distance was for 100 through 1200 yds or whatever it might end up being without having to dial anything in. Do you know of any programs that will do that?

 

[BapZander]

Re: scope mil lines for max range holdover distances

You can change the output in jbm to mil. Look for column 2 units at the bottom of the input page.

 

[Guest]

Re: scope mil lines for max range holdover distances

All mine are set that way, wither they have a mil or IPHY glass.
On the only mil scope I have( waiting to change it over to a IPHY as well)where the thick and thin meet at the very top is the 100yd hold point. If I have to make a in the ear shot I dial down 3.5moa and hold the ctr of the first dot.

The crt X is 635 yds and the thick and thin at the bottom is 950(short barreled 308). I have all the data for every load (other than base) as colored dots on the range/dot chart that is on the weapon. All my IPHY sticks are the same way. 60 IPHY of hold gets them all long w/o the need for dialing at all. Just range, hold and shoot.

 

[longeye51]

Re: scope mil lines for max range holdover distances

Thanks, that did the trick. I can set it up from there.
That link is going to "favorites."

 

[longeye51]

Re: scope mil lines for max range holdover distances

BapZander,

Thanks, that did the trick. I can set it up from there.
That link is going to "favorites."

 

[longeye51]

Re: scope mil lines for max range holdover distances

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Gunfighter14e2</div><div class="ubbcode-body">All mine are set that way, wither they have a mil or IPHY glass.
On the only mil scope I have( waiting to change it over to a IPHY as well)where the thick and thin meet at the very top is the 100yd hold point. If I have to make a in the ear shot I dial down 3.5moa and hold the ctr of the first dot.

The crt X is 635 yds and the thick and thin at the bottom is 950(short barreled 308). I have all the data for every load (other than base) as colored dots on the range/dot chart that is on the weapon. All my IPHY sticks are the same way. 60 IPHY of hold gets them all long w/o the need for dialing at all. Just range, hold and shoot. </div></div> Thanks for the input, mine are all about to be the same way.

 

[longeye51]

Re: scope mil lines for max range holdover distances

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Gunfighter14e2</div><div class="ubbcode-body">All mine are set that way, wither they have a mil or IPHY glass.
On the only mil scope I have( waiting to change it over to a IPHY as well)where the thick and thin meet at the very top is the 100yd hold point. If I have to make a in the ear shot I dial down 3.5moa and hold the ctr of the first dot.

The crt X is 635 yds and the thick and thin at the bottom is 950(short barreled 308). I have all the data for every load (other than base) as colored dots on the range/dot chart that is on the weapon. All my IPHY sticks are the same way. 60 IPHY of hold gets them all long w/o the need for dialing at all. Just range, hold and shoot. </div></div> BapZander,

Thanks, that did the trick. I can set it up from there.
That link is going to "favorites."

 

[longeye51]

Re: scope mil lines for max range holdover distances

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: BapZander</div><div class="ubbcode-body">You can change the output in jbm to mil. Look for column 2 units at the bottom of the input page.</div></div> BapZander, It took me a couple of tries, but I finally got this response in the right place.

Thanks, that did the trick. I can set it up from there.
That link is going to "favorites."

 

[longeye51]

Re: scope mil lines for max range holdover distances

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: DFOOSKING</div><div class="ubbcode-body">Divide it by 3.438</div></div> DFOOSKING, Thanks for your input as well. That is the calculation I was wondering about. Now I know how to do it on paper and can verify on the ballistics calculator. I always want to know how to do it low tech because high tech is not always there when you need it. A pencil and paper (or a stick and dirt) never lose their charge or have some kind of electronic malfunction.

 

[UNCIVILIZED]

Re: scope mil lines for max range holdover distances

If you don't have a Mildot Master, I HIGHLY recommend picking up one [actually 2, thus you have a spare]. As you say, no batteries, low tech... they're basically a slide rule. AKA pre-calculator calculators.

 

[longeye51]

Uncivilized,

Will do. I guess low tech/high tech is relative, i.e., stick and dirt, pencil and paper, Mildot Master and ballistics calculator.

Thanks for the input,

If you don't have a Mildot Master, I HIGHLY recommend picking up one [actually 2, thus you have a spare]. As you say, no batteries, low tech... they're basically a slide rule. AKA pre-calculator calculators.

 

[longeye51]

Topstrap,

Thanks for the link. As discussed with BapZander, it is going to "favorites." I now have a good layout for my reticle mil lines.

If you enter all your info into JBM ballistics and played a bit with different zero settings and checked the rise and fall at each distance compared to the size of your targets you could figure out the best zero distance for your particular setup. You can move your zero distance in the program to see the changes on the chart. Set it to show distances at smaller amounts such as 10 yard intervals to give you better information.

JBM - Calculations - Trajectory (Simplified)

Topstrap