Hey all! I have a question as a newcomer to long range shooting. While looking at range finders I came across the term ARC (angle range compenation). The manufacture claimed that by factoring in the line of sight distance along with the angle to the target, you get the true ballistic distance. While a neat feature, it came across to me as irelivant. Since the line of sight distance is the actual distance the bullet must travel to reach the target, isnt that the distance you should use while ranging? Is this just a gimic to sell range finders or am I missing the boat on this one?
Rifle Scopes ARC ( Angle Range Compensation )
- Thread starter tmhxpumper
- Start date
Re: ARC ( Angle Range Compensation )
Missing the boat, I'm afraid. But it's an excellent question to ask.
http://www.freepatentsonline.com/y2009/0200376.html
Search angles here. Or, Mike Lau has a good explanation of it in his book. Or, the Sierra ballistics manual has an excellent explanation also.
But you don't need a compensator in your rangefinder, you can use the improved rifleman's rule to multiply your dope by the cosine of the angle.
Missing the boat, I'm afraid. But it's an excellent question to ask.
http://www.freepatentsonline.com/y2009/0200376.html
Search angles here. Or, Mike Lau has a good explanation of it in his book. Or, the Sierra ballistics manual has an excellent explanation also.
But you don't need a compensator in your rangefinder, you can use the improved rifleman's rule to multiply your dope by the cosine of the angle.
Re: ARC ( Angle Range Compensation )
Shooting up hill or down hill will actually make the distance seem shorter to the bullet. Gravity makes the difference.
Buy yourself a Mildot Master. It is a slide ruler that has all the stuff all figured out for you. You just range the distance in straight line, use the mildot master to find the actual angle then set the angle and distance into the slide ruler and you now have the actual distance you should shoot.
Cosign indicators and a little multiplication work well too.
Shooting up hill or down hill will actually make the distance seem shorter to the bullet. Gravity makes the difference.
Buy yourself a Mildot Master. It is a slide ruler that has all the stuff all figured out for you. You just range the distance in straight line, use the mildot master to find the actual angle then set the angle and distance into the slide ruler and you now have the actual distance you should shoot.
Cosign indicators and a little multiplication work well too.
Re: ARC ( Angle Range Compensation )
The bullet doesn't the know the difference. The short answer is that gravity acts on the bullet for a shorter distance. The correct compensation for the trajectory is based on the distance the bullet travels perpendicular to the ground, not in the air.
The bullet doesn't the know the difference. The short answer is that gravity acts on the bullet for a shorter distance. The correct compensation for the trajectory is based on the distance the bullet travels perpendicular to the ground, not in the air.
Re: ARC ( Angle Range Compensation )
Here's the straight scoop on shooting at up or down angles from Sierra Ballistics:
Inclined Fire Explained
Here's the straight scoop on shooting at up or down angles from Sierra Ballistics:
Inclined Fire Explained
Re: ARC ( Angle Range Compensation )
Thanks for the info guys. I'm starting to wrap my little head around this concept. Lindy, I just found that page while doing a search for the manuals that Graham recomended. It looks very detailed and I have some reading to do. Thanks agian for the help.
Thanks for the info guys. I'm starting to wrap my little head around this concept. Lindy, I just found that page while doing a search for the manuals that Graham recomended. It looks very detailed and I have some reading to do. Thanks agian for the help.
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