Range of arc - The Firearms Forum

1LoneWolf75 · 11-29-2012, 10:50 PM

This may be in the wrong section but...
My dad had a question fer me regardin the range of the arc of his 7.62x54. When does the arc cross back over the original line of travel? He is usin 173 gr silver bear ammo.
Thanks

aa1911 · 11-29-2012, 10:52 PM

depends on where you zero it at. Every zero actually has two zeros.

for instance, .223 zeroed at 25m is also zeroed for approx 300m due to the arc.

Don't know off the top of my head what the trajectory for that bullet/ammo is

1LoneWolf75 · 11-29-2012, 11:03 PM

Well at least you knew what I was askin. Not exactly sure why he wants to know he just called me.

rcairflr · 11-30-2012, 04:39 AM

I made some assumptions:
1. Sight height is 1.5 inches (scoped)
2. Ballistic Coefficient of .450
3. Muzzle Velocity of 2550 fps
4. Rifle sighted in at 100 yards.

Making the above assumptions, the bullet arc would cross 0 at 50 and 100 yards or would cross the original height of the barrel at about 150 yards.

Attached is a picture of the bullet trajectory out to 250 yards

If you want a better answer, I will need better information.

1LoneWolf75 · 11-30-2012, 09:45 PM

Thank you rcailfr. He is using iron sights, like me hates scopes. I know he can hit a coyote at 300 yrds. I'll ask more when I talk to him agian.

10pm Talked to my dad and he sighted it in at 200 yrds. Like I said he is using iron sights along with the silver bear 173 gr bullet. Thank you again.

11-29-2012, 10:50 PM	#1
1LoneWolf75 Senior Member Join Date: Apr 2012 Location: Humboldt KS Posts: 584	Range of arc This may be in the wrong section but... My dad had a question fer me regardin the range of the arc of his 7.62x54. When does the arc cross back over the original line of travel? He is usin 173 gr silver bear ammo. Thanks __________________ They can have my guns when they pry them from my cold, dead hands!!! "Democracy will cease to exist when you take away from those who are willing to work and give to those who are not." - Thomas Jefferson "I've seen the system fall apart from the rules and all our presidents lie"--"Soul Survive"- Asphalt Ballethttp://www.youtube.com/watch?v=w6DgVrYWw00 -->

11-29-2012, 10:52 PM	#2
aa1911 Advanced Senior Member Join Date: Dec 2010 Location: Pacific Northwest Posts: 3,112	Re: Range of arc depends on where you zero it at. Every zero actually has two zeros. for instance, .223 zeroed at 25m is also zeroed for approx 300m due to the arc. Don't know off the top of my head what the trajectory for that bullet/ammo is __________________ "Loud noises don't end gunfights.... well placed shots do."

11-29-2012, 11:03 PM	#3
1LoneWolf75 Senior Member Join Date: Apr 2012 Location: Humboldt KS Posts: 584	Re: Range of arc Well at least you knew what I was askin. Not exactly sure why he wants to know he just called me. __________________ They can have my guns when they pry them from my cold, dead hands!!! "Democracy will cease to exist when you take away from those who are willing to work and give to those who are not." - Thomas Jefferson "I've seen the system fall apart from the rules and all our presidents lie"--"Soul Survive"- Asphalt Ballethttp://www.youtube.com/watch?v=w6DgVrYWw00

11-30-2012, 04:39 AM	#4
rcairflr Advanced Senior Member Join Date: Jul 2011 Location: Wichita, Ks Posts: 1,315	Re: Range of arc I made some assumptions: 1. Sight height is 1.5 inches (scoped) 2. Ballistic Coefficient of .450 3. Muzzle Velocity of 2550 fps 4. Rifle sighted in at 100 yards. Making the above assumptions, the bullet arc would cross 0 at 50 and 100 yards or would cross the original height of the barrel at about 150 yards. Attached is a picture of the bullet trajectory out to 250 yards If you want a better answer, I will need better information. Attached Images Last edited by rcairflr; 11-30-2012 at 05:33 AM..

11-30-2012, 09:45 PM	#5
1LoneWolf75 Senior Member Join Date: Apr 2012 Location: Humboldt KS Posts: 584	Re: Range of arc Thank you rcailfr. He is using iron sights, like me hates scopes. I know he can hit a coyote at 300 yrds. I'll ask more when I talk to him agian. 10pm Talked to my dad and he sighted it in at 200 yrds. Like I said he is using iron sights along with the silver bear 173 gr bullet. Thank you again. __________________ They can have my guns when they pry them from my cold, dead hands!!! "Democracy will cease to exist when you take away from those who are willing to work and give to those who are not." - Thomas Jefferson "I've seen the system fall apart from the rules and all our presidents lie"--"Soul Survive"- Asphalt Ballethttp://www.youtube.com/watch?v=w6DgVrYWw00 Last edited by 1LoneWolf75; 11-30-2012 at 10:06 PM.. Reason: more info