Who knows where to find ballistic charts?

[dschutte]

Hello,

Does anyone know where to find ballistic charts (distance readings/scope settings), specifically for the Winchester .308 Ballistic Silvertip round (168 gr. boattail)? I have a 10FCP HS Precision supporting a Leupold Mark IV with a TMR. (I'm zeroed at 200 meters now.) Is there any way to find readings with this combination for up to 1000 yards or meters, is there a simple trajectory formula, or do I just need to do my own range time and create my own specs?

Thanks!

 

[Ridgerunner665]

You can't use charts for those kind of distances.

Do your own range time and create your own specs.

 

[benzy2]

You can run the info into certain programs and get close but close is as good as its going to get. You will get a rough estimation though. I wouldn't want to take a rifle zeroed for 200 yards and just go blindly to the 1000 yard range and start shooting. I would want a rough guess how much elevation I would need.

 

[lvcat2004]

yes, there are programs that will give you an "estimate". Google ballistic software and such, it shouldn't be too hard to find.

 

[dschutte]

Thanks guys...three great answers! Using technology, e.g. software, to get "close" is encouraging. After all, getting precise is why we shoot anyway, right?

 

[JimKirk]

JBM Calculations

http://www.eskimo.com/~jbm/calculations/calculations.html

Try This link .

Jimmy K

 

[Ruger]

dschuttle, Hello welcome to the High Road. I had a link for factory Win loads but I can't seem to find it sorry.

Most of the factory ammo suppliers have a Ballistics chart on the web .. just type in IE: Win, Fed,Rem ballistics for ammo and what cal your shooting and then you can use there calculations and come up with a recipe of your own ..
Good luck Ruger

 

[Uncle Mike]

Grab all the Velocity info.(Muzzel velocity/fps) of your desired load from the manufcturer's web site and hop on over to Hornady.com, go to ballistic calculator, plug in the prompted information and hit the go button.

You WILL need your bullets ballistic coefficient.

Remember that most ballistic calculators use a 24" barrel,(Hornady does) so if your barrel is shorter then 24", you'll have to subtract 25fps per INCH of barrel length difference from your starting velocity.(ie... 24"= 2900fps
then 22" would = 2850fps)

The Hornady site will calculate drop, v/e, come-up, MOA, ect... and do it for different temperatures and barometer. This site is a bit less complicated than eskimo.com.

Also check out Norma.com... excellent site, has a graph type ballistic chart that will let you see your bullets trajectory and much more.

 

[hinton03]

They havce a lot of stuff here; it is generally where I start. http://stevespages.com/page8.htm

 

[USSR]

Remember that most ballistic calculators use a 24" barrel,(Hornady does) so if your barrel is shorter then 24", you'll have to subtract 25fps per INCH of barrel length difference from your starting velocity.(ie... 24"= 2900fps then 22" would = 2850fps)

Without a chronograph, you have no idea what your velocity is. For example, I have 2 .30-06's, both with 26" match barrels. With the very same load, one gets 2875fps, and the other 2950fps. Once you know your actual velocity, THEN you can plug the velocity and BC of the bullet into your exterior ballistics program and come up with approximate ballistics data.

Don

 

[Maverick223]

I generally use a program called PointBlank, is is free and has some great features. Get it here, it will get you on paper at about any range, you just might need BIG paper.

 

[glockman19]

I have a ballistics calculator for my i-phone. with 2" mounts and a 200 meter zero your 1,000 yards would:
have a drop of 352" or 33.6 moa. for a Barnes 168 grain w/2800fps @ muzzle at an angle of 0 degrees 10 mph wind at 90 degree angle and a temp of 59 and humidity at 78%.

 

[MCMXI]

Without a chronograph, you have no idea what your velocity is. For example, I have 2 .30-06's, both with 26" match barrels. With the very same load, one gets 2875fps, and the other 2950fps. Once you know your actual velocity, THEN you can plug the velocity and BC of the bullet into your exterior ballistics program and come up with approximate ballistics data.

It's an iterative process too. I worked up a .308 load for my last match that I'd chronographed at an average velocity of 2,675 fps (average of 20 rounds). Based on that velocity and the BC of the bullet, ExBal (from Nightforce) told me that I needed to dial in 13.25 MOA elevation at 600 yards. After my first sighter at that setting which was 3" high, I made a correction to 12.75 MOA and my second sighter was perfect.

After playing with the velocity a little in ExBal, based on my elevation corrections, my load's "actual" velocity was 50 fps faster at 2,725 fps. I had the chronograph about 15' from the muzzle when I worked up the load and I was shooting from a shaded position. During the match, I was in direct sunlight so those two factors could easily account for the 50 fps difference. Keeping good records during a match can be very helpful.

 

[Uncle Mike]

1858... how was your "day", as we used to say-
Your atmosphere was probably different between your range day and your match day.

Just a thought.

 

[MCMXI]

Uncle Mike, altitude density was basically the same as was humidity (minimal effect anyway). I should add that the load was worked up with new Lapua cases but I neck-sized and reloaded once-fired cases for the match. I think the heat of the sun and the barrel/chamber were the main factors but that's just a guess.

dschutte, here's some .308 Win Supreme Ballistic Silvertip data that you might find useful. I entered the BC and MV values listed on Winchester's web site HERE. I entered a target speed of 4mph ... just in case.


Data in meters.

Data in yards.

 

[Uncle Mike]

Yea... probably so!
How do you like the Nightforce program?

 

[MCMXI]

How do you like the Nightforce program?

I like it A LOT!! I like the options for calculating, displaying and exporting data depending on what type of scope you have.

 

[the foot]

No data will be accurate without realistic muzzle velocity. First, get a good idea of your muzzle velocity; the only way to be exact is with a chronograph.

Then, a ballistics table or computer program will be accurate for your bullet. And you will be able to hit paper at 1000 meters.

I love my Chrony, < $100. Accurate, easy to set up, etc.

 

[jpwilly]

I was just at Cabela's and they had pretty much everything in stock including 6.8SPC but all at reletively high prices. Reloading components were pretty much gone though.