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dialing in long range game

 
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  #8  
Old 09-15-2003, 05:45 PM
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Join Date: Jun 2001
Location: Palmer, Alaska
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Re: dialing in long range game

The one thing I would add to Dave's most excellent advice, is that after you measure the actual drop in inches and adjust for the new range, verify it with another group to see if the setting you figured actually brings the group up to the center of the bull. There is a chance you could be high or low a few inches if your scope isn't calibrated correctly and it must be verified.

You should be able to match your fired drops up to a ballistic program at each interval they were shot at if you know your average MV, and by adjusting the BC of the bullet until the drops on the program match your fired drops. If you don't have a perfect 100yd zero, the program will likely be quite a bit off at distance, as it assumes you are not .25 or even .5 MOA or more off to begin with, so dial it in well at 100yds.

Once you get the actual drops matched up with the program at say, 100 yards increment, the program will be able to predict the drop for ranges in between them pretty accurately, BUT this is no guarantee it will predict farther distances accurately, and it probably WON'T either. The BC drag curve and other things will affect its modeling ability so it needs to be verified well.

This will also give you more confidence in your load and shooting technique, and also your real world grouping ability at the various ranges which will help you determine how far you might be able to shoot in the same conditions etc.

Good luck, knock one dead! [img]images/icons/smile.gif[/img]
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Brent Moffitt
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  #9  
Old 09-15-2003, 06:52 PM
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Join Date: Aug 2003
Location: McKinney TX
Posts: 403
Re: dialing in long range game

Smoak,

I think Dave King hit the nail on the head and has given you the best advice. I'll add one more thing that piggybacks on what Dave said and Brent mentions.

Knowing your actual come-ups for each yardage value is critical. Then being able to match that to a ballistic program is the next step. But there is one more thing to consider and this is will tie it all together.

You said your going to hunt in CO for the first time. Depending on where you recorded your actual shooting data, it may be null and void once you get to CO and youíre hunting in colder temps and higher altitudes. Say you recorded your data at 600í elevation and 80 degrees and your going hunting at 9000í and temps in the 20ís & 30ís. Your data is not going to be accurate. Also, there comes the additional factor of shooting up or down hill. Again, your ballistic program you can help you with this.

Now, if you can get your ballistic program to match your actual recorded data, then you should be able to adjust it for altitude and temps and be very close once youíre in CO. Keep an accurate logbook and make lots of different data charts covering different altitudes, temps as well as up/down angles.

But all of this will be null and void if you donít practice shooting at those distances.

Keep us posted on how youíre doing. If you give me your actual data on your velocities and come-ups, Iíll run it through my ballistic program and see if I can get it to match. Then let me know the conditions youíll be hunting in and Iíll run some variables for you.

Best of luck to you!
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Jeff

Mathew 5:16

Distance is not an issue, but the wind will make it interesting!
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  #10  
Old 09-15-2003, 11:33 PM
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Join Date: Nov 2001
Location: culpeper va
Posts: 71
Re: dialing in long range game

Smoak, A little more information may be helpful in answering your questions.Most importantly,how far are you expecting to shoot? And what experience do you already have with long range shooting? How accurate are you and your gun?
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  #11  
Old 09-15-2003, 11:34 PM
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Join Date: May 2001
Location: Pennsylvania
Posts: 1,757
Re: dialing in long range game

Smoak

Do not attemt any shot that you have not practiced hitting a target at every 100 yards across the field of fire you are attemting.

Make up an actual fire drop chart for "YOUR" rifle and start learning the clicks needed at each 50 to 100 yards to get to the target.

If you have a holdover type reticule then practice with that so you will know where to hold on the animal.

You MUST know the exact range you are shooting and that calls for a good rangefinder.

Practice long before you go out west and also look at the elevation you intend to shoot at.
This will change ballistics from lower elevations to higher.

Suggestion-----Go practice ASAP.

DC
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Darryl Cassel
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  #12  
Old 09-15-2003, 11:47 PM
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Join Date: Jun 2003
Location: Eastern US
Posts: 61
Re: dialing in long range game

Smoak,

Don't take our suggestions as flames. We're protecting our sport from those who would take it lightly and resulting in unsportsmanlike results.

As the guys above have mentioned, the best thing for you to do is just get out there and practice. Try a few shots at 100, 200, 300, 400, 500, and so on. Know what your bullet will do at those ranges. Once you know how far the quarry is, you can have a good idea where your bullets are going to hit. Practice in the wind and not just off a bench but with your bi-pod or field shooting position. Of course, get a rangefinder. If you have access to those computer programs like Oehler and a chronograph, so much the better. However, the best gun, chronograph, computer program and other stuff won't, by itself, make you a good long range shot. Only practice will!

Good luck. LR shooting is time consuming and can eat up some $$$ but it is fun and well worth it.
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