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# trajectory zero program

#1
10-27-2009, 08:53 PM
 Silver Member Join Date: Oct 2009 Posts: 187
trajectory zero program

i have a few questions about the trajectory zero angle program, i got it from a member on this site so i figured its a good place to ask.

1. when i first used it, i input the twist rate. i have a 1:16 twist 22 inch barrel
so is it a 1 1/4 twist rate?
as i understand a 1:16 twist in a 16 inch barrel would be 1 twist rate right?
so in the program i put in 1.25 for twist rate at first it accepted that now it changes to 6:00 when i input 1.25? am i doing this right? and is this correct? just a different way of saying the same thing?

2.what is the impact ht. its impact height correct? if so what is that? is that the height of the hole the bullet makes? if not how do i measure it?

3. angle of fire, is level shooting 0 degrees? and shooting a sleight down angle would that be like 350 degrees or am way off? if so what is the correct way to use this function?

4.bullet length is that the projectile? or the projectile and cartrige combined if i put in the projectile length it spits out 360 inches of wind at 100 yds so thats not right, when i put the cartrige and projectile length i get 1/2 inch wind at 100 yds and thats about what i see at the range, so i think thats right.

please answer any questions you can even if you only know how to answer one of my questions please do, any answers you can give will help, thanks
#2
10-27-2009, 10:25 PM
 Platinum Member Join Date: Jan 2003 Location: The rifle range, or archery range or behind the computer in Alaska Posts: 3,830
Re: trajectory zero program

Quote:
 Originally Posted by Savageman69 i have a few questions about the trajectory zero angle program, i got it from a member on this site so i figured its a good place to ask. 1. when i first used it, i input the twist rate. i have a 1:16 twist 22 inch barrel so is it a 1 1/4 twist rate? as i understand a 1:16 twist in a 16 inch barrel would be 1 twist rate right? so in the program i put in 1.25 for twist rate at first it accepted that now it changes to 6:00 when i input 1.25? am i doing this right? and is this correct? just a different way of saying the same thing? Not correct. a 1:16 twist should be entered as 16. 2.what is the impact ht. its impact height correct? if so what is that? is that the height of the hole the bullet makes? if not how do i measure it? You can ignore that. I am not sure why I put that stupid field there. It is for using (for example) shooting at 100 yards but your impact (or zero) is 3" high at 100 yards. It is for if you dont know your zero but know how high youre impacting at the range youre shooting at. 3. angle of fire, is level shooting 0 degrees? and shooting a sleight down angle would that be like 350 degrees or am way off? if so what is the correct way to use this function? Level is 0 degrees. Any other angle up or down is 1 thru 90 degrees. 4.bullet length is that the projectile? or the projectile and cartrige combined if i put in the projectile length it spits out 360 inches of wind at 100 yds so thats not right, when i put the cartrige and projectile length i get 1/2 inch wind at 100 yds and thats about what i see at the range, so i think thats right. Bullet length is just that. Bullet length. It is the meplat of the bullet to the base of the bullet (overall length of the projectile) in inches. please answer any questions you can even if you only know how to answer one of my questions please do, any answers you can give will help, thanks
#3
10-28-2009, 01:06 AM
 Silver Member Join Date: Oct 2009 Posts: 187
Re: trajectory zero program

ahhh thank you so much for your help (and the program btw)

one last thing if you would be so kind, i tried to enter 16 for twist rate and it wont let me do so it, the program just puts it at 0:00 but i get a result almost exactly what i see at the range, i think the variation at the range is operator error so thats fine, and i dont enter wind cuz at my range there really isnt any
for the twist rate does the length of the barrel change the value, i have a 22 inch barrel is that still a twist of 16?

but everything else helped out alot thank you, thank you
#4
10-28-2009, 01:57 AM
 Platinum Member Join Date: Feb 2005 Location: Nevada Posts: 2,783
Re: trajectory zero program

Quote:
 Originally Posted by Savageman69 ahhh thank you so much for your help (and the program btw) one last thing if you would be so kind, i tried to enter 16 for twist rate and it wont let me do so it, the program just puts it at 0:00 but i get a result almost exactly what i see at the range, i think the variation at the range is operator error so thats fine, and i dont enter wind cuz at my range there really isnt any for the twist rate does the length of the barrel change the value, i have a 22 inch barrel is that still a twist of 16? but everything else helped out alot thank you, thank you
Let me try to help with part of your question.
1:16 twist rate means that the twist makes one full turn in 16 inches. The
barrel length does not matter. Your barrel could be any length you want
to dream up and still be 1:16 twist rate.
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Last edited by Eaglet; 10-28-2009 at 03:41 AM.
#5
10-28-2009, 02:46 AM
 Silver Member Join Date: Dec 2008 Location: Canberra, Australia Posts: 119
Re: trajectory zero program

And where do I get this program?
#6
10-28-2009, 10:36 AM
 Platinum Member Join Date: Jan 2003 Location: The rifle range, or archery range or behind the computer in Alaska Posts: 3,830
Re: trajectory zero program

Quote:
 Originally Posted by Savageman69 ahhh thank you so much for your help (and the program btw) one last thing if you would be so kind, i tried to enter 16 for twist rate and it wont let me do so it, the program just puts it at 0:00
That is because at one time you entered 1:16 and teh program changed the field value to time. Now that you enter a number other than time format, it defaults to 0:00.

Right click the box, select 'format cells' and select general number. Then enter just plain 16.

Hope that helps!
#7
10-28-2009, 03:39 PM
 Silver Member Join Date: Oct 2009 Posts: 187
Re: trajectory zero program

that does indeed help thanks a million i fixed it

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