.22r

ammo.crafter · December 13, 2014, 12:35 AM

How do you calculate the trajectory of a standard velocity .22lr 40gr round?

I'm looking for short yard distances no greater than 25tyds.

B.L.E. · December 13, 2014, 07:35 AM

Go to an online ballistics calculator.

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

Plug in the velocity usually stated by the ammo manufacturer and plug in 0.13 for a ballistic coefficient.
That will get you very close.

ammo.crafter · December 13, 2014, 07:52 AM

Great reference, thanks.

B.L.E. · December 13, 2014, 08:01 AM

At ranges less than 25 yards, the biggest factor will by your sight height, how high the sights are above the bore. It's like the viewfinder lens of a twin lens camera, the viewfinder can not see exactly the picture that the camera lens sees. So, if you are aiming at the head of a squirrel that's only five feet away, and you forget that the scope is 1.5 inches above the barrel, you will shoot under the squirrel's head, because the barrel is 1.5 inches below the scope you are aiming through.

December 13, 2014, 12:35 AM	#1
ammo.crafter Senior Member Join Date: June 25, 2006 Location: The Keystone State Posts: 1,970	.22r How do you calculate the trajectory of a standard velocity .22lr 40gr round? I'm looking for short yard distances no greater than 25tyds. __________________ "Peace is that brief glorious moment in history when everybody stands around reloading". --Thomas Jefferson

December 13, 2014, 07:35 AM	#2
B.L.E. Senior Member Join Date: December 20, 2008 Location: Somewhere on the Southern shore of Lake Travis, TX Posts: 2,603	Go to an online ballistics calculator. http://www.jbmballistics.com/cgi-bin/jbmtraj-5.1.cgi Plug in the velocity usually stated by the ammo manufacturer and plug in 0.13 for a ballistic coefficient. That will get you very close. __________________ Hanlon's Razor "Do not invoke conspiracy as explanation when ignorance and incompetence will suffice, as conspiracy implies intelligence and organization."

December 13, 2014, 07:52 AM	#3
ammo.crafter Senior Member Join Date: June 25, 2006 Location: The Keystone State Posts: 1,970	THX Great reference, thanks. __________________ "Peace is that brief glorious moment in history when everybody stands around reloading". --Thomas Jefferson

December 13, 2014, 08:01 AM	#4
B.L.E. Senior Member Join Date: December 20, 2008 Location: Somewhere on the Southern shore of Lake Travis, TX Posts: 2,603	At ranges less than 25 yards, the biggest factor will by your sight height, how high the sights are above the bore. It's like the viewfinder lens of a twin lens camera, the viewfinder can not see exactly the picture that the camera lens sees. So, if you are aiming at the head of a squirrel that's only five feet away, and you forget that the scope is 1.5 inches above the barrel, you will shoot under the squirrel's head, because the barrel is 1.5 inches below the scope you are aiming through. __________________ Hanlon's Razor "Do not invoke conspiracy as explanation when ignorance and incompetence will suffice, as conspiracy implies intelligence and organization."