Ballistic change between different places?

[dfanonymous]

Ok, I think I'm having a difficult time grasping everything haha. I'm confused as to how I'm supposed to determine true drop when I'm out hunting, where weather, temperature, etc. are all so variable. Do I really need to sit there in the field with a calculator to compute it? I understand I can print charts ahead of time, but what if temperature, etc. Doesn't fit within the boundaries of the charts?

just read what I posted, read the how to article. Use the links, print a few samples, go out and test them. If you have to tweak a few things to make the data line up then do it. Make the numbers work. Print them off, put them in a ziplock freezer bag and you're Gucci. There's also methods of interpolation.

 

[Bravo 4]

I think that you are either overthinking this or getting overwhelmed...or both. You are getting good info, just different methods. I was self taught before I received professional instruction, what I did learn is that there are multiple ways to skin a cat and the more ways you know the better off you're going to be. The flip side is that multiple people telling an inexperienced person how to accomplish a task using various methods can be counter productive, I see how easy it is for my students to get information overload. So I will step back, if you want anything from me just shoot me a pm.
Good luck

 

[dfanonymous]

I think that you are either overthinking this or getting overwhelmed...or both. You are getting good info, just different methods. I was self taught before I received professional instruction, what I did learn is that there are multiple ways to skin a cat and the more ways you know the better off you're going to be. The flip side is that multiple people telling an inexperienced person how to accomplish a task using various methods can be counter productive, I see how easy it is for my students to get information overload. So I will step back, if you want anything from me just shoot me a pm.
Good luck

Sorry, wasn't trying to cross into your lane bud. I missed who he quoted as I'm hanging off my roof hanging up Xmas lights.

 

[Bravo 4]

No worries brother, I know you have a bit of a background in this game.
Good luck with your multitasking!

 

[Brydawg512]

just read what I posted, read the how to article. Use the links, print a few samples, go out and test them. If you have to tweak a few things to make the data line up then do it. Make the numbers work. Print them off, put them in a ziplock freezer bag and you're Gucci. There's also methods of interpolation.

Thank you!

So, I understand that I can create several reference cards with multiple elevation/temperature combinations.. As far as determining "DA", how do I do that using the chart you provided with all the lines? Once I determine the true DA, do I just use the reference card for that altitude and then match the drop for the closest temperature group I have?

 

[dfanonymous]

Thank you!

So, I understand that I can create several reference cards with multiple elevation/temperature combinations.. As far as determining "DA", how do I do that using the chart you provided with all the lines? Once I determine the true DA, do I just use the reference card for that altitude and then match the drop for the closest temperature group I have?

Yes. Use a kestrel, or a gps, a method of finding temp and the chart I put i attached in the post.

More tools and info.

http://www.arcanamavens.com/LBSFiles/Shooting/Downloads/ManualDA/

 

[Brydawg512]

Yes. Use a kestrel, or a gps, a method of finding temp and the chart I put i attached in the post.

More tools and info.

http://www.arcanamavens.com/LBSFiles/Shooting/Downloads/ManualDA/

I believe I understand.. I just did a rough test, for an altitude of 6,000. This have me a rough barometric of 23.75, which was roughly 6,200. Do I then trace the blue line on the graph, for say 50 degrees, which gives me a density altitude of 7,000. So, then would I use a drop data card that is set for 7,000 feet?

 

[dfanonymous]

I believe I understand.. I just did a rough test, for an altitude of 6,000. This have me a rough barometric of 23.75, which was roughly 6,200. Do I then trace the blue line on the graph, for say 50 degrees, which gives me a density altitude of 7,000. So, then would I use a drop data card that is set for 7,000 feet?

now build up a data card and go test it out on target. Get the DA at your range, pull the card that matches and verify trajectory.

Make sure you have the right muzzle velocity and put the zero temp into the data card on JBM. These are the values which the calculator will base the values off each DA and temp you put in to make the drop an accurate field firing solution. If you are using a magnetospeed use zero for chrono distance and everything else you'd normally do for dope.

 

[Brydawg512]

Yes. Use a kestrel, or a gps, a method of finding temp and the chart I put i attached in the post.

More tools and info.

http://www.arcanamavens.com/LBSFiles/Shooting/Downloads/ManualDA/

Also, thank you very much for all of the information and knowledge you have passed my way -- although it may not seem it, I think I'm slowly understanding things.

My last question for now: Say I plug in my values to the calculator, ans it spits out drop values for 4, 5, and 600 yards. At 500 yards, it says 1.4 mil, but I confirm that my "true" is 1.6 mil. Once I have trued all of my values, I am set for those specific conditions.

When I print a sheet for a different altitude and temperature range, it will print different drop values, however, these won't necessarily be "trued". Is the only method to do actual field testing to true these new values for the new elevation/temperature? Or is there a way to convert my previously trued values for a different environmental setting to this new one?

Sorry for so many questions, and thank you again! Happy holidays, and Merry Christmas!

 

[dfanonymous]

Also, thank you very much for all of the information and knowledge you have passed my way -- although it may not seem it, I think I'm slowly understanding things.

My last question for now: Say I plug in my values to the calculator, ans it spits out drop values for 4, 5, and 600 yards. At 500 yards, it says 1.4 mil, but I confirm that my "true" is 1.6 mil. Once I have trued all of my values, I am set for those specific conditions.

When I print a sheet for a different altitude and temperature range, it will print different drop values, however, these won't necessarily be "trued". Is the only method to do actual field testing to true these new values for the new elevation/temperature? Or is there a way to convert my previously trued values for a different environmental setting to this new one?

Sorry for so many questions, and thank you again! Happy holidays, and Merry Christmas!

It should be on since it's a result of muzzle velocity if the muzzle velocity is trued to the computer. There's no real trueing the atmospherics. This is why you want to establish the a known baseline that the rest of your data is based on. So if you're at the range and the day you shot/confirm zero/ chrono is a DA of 5000 at 51 F. and you are off by 2/10 mils, simply adjust the muzzle velocity so the data is true and the use that value for all the other DAs. It should be on at 600 for all DAs.

Beyond 1000 this whole method doesn't work as good, and you need to really do some major refining, other data, understanding danger space, and be closer on your DA.

 

[Brydawg512]

It should be on since it's a result of muzzle velocity if the muzzle velocity is trued to the computer. There's no real trueing the atmospherics. This is why you want to establish the a known baseline that the rest of your data is based on. So if you're at the range and the day you shot/confirm zero/ chrono is a DA of 5000 at 51 F. and you are off by 2/10 mils, simply adjust the muzzle velocity so the data is true and the use that value for all the other DAs. It should be on at 600 for all DAs.

Beyond 1000 this whole method doesn't work as good, and you need to really do some major refining, other data, understanding danger space, and be closer on your DA.

Ok, I think I have it! So, say I chrono 3100, and it says I should adjust 1.4 mil for 600 yards. I shoot high, where I determine 1.6 mil is actual zero. I would then adjust FPS to 3150 (or so) till the calculator states that I need to adjust 1.6 mil at 600, and then the rest of my data should be correct?

 

[dfanonymous]

Ok, I think I have it! So, say I chrono 3100, and it says I should adjust 1.4 mil for 600 yards. I shoot high, where I determine 1.6 mil is actual zero. I would then adjust FPS to 3150 (or so) till the calculator states that I need to adjust 1.6 mil at 600, and then the rest of my data should be correct?

Yep. Let us know how it goes.

 

[Bravo 4]

Ok, I think I have it! So, say I chrono 3100, and it says I should adjust 1.4 mil for 600 yards. I shoot high, where I determine 1.6 mil is actual zero. I would then adjust FPS to 3150 (or so) till the calculator states that I need to adjust 1.6 mil at 600, and then the rest of my data should be correct?

Not trying to be a smarty pants or seem like a know it all but I've got a small tweak to your above post. When you increase your muzzle velocity your drops will be less at distance, not more. So in your example the drop would be more like 1.2 mil instead of 1.6...please continue.

 

[338 dude]

Ok, thank you. Now, when I use JBM, how do I input my "true" drop values so it can create the other "trued" drop cards with different elevations/temperatures? Also, I noticed on their website I have to input a bunch of variables like bullet length and what not -- if I'm using factory loads, how do I know this?

Understood about using a GPS for elevation and a tool for temp, but how do I determime my drop quickly? Do I have to carry several sets of drop cards with me that outline 3 different temperatures at 3 different elevations?

What bullet are you shooting