I want to have my Leupold Custom Dial Done and the Tech at Leupold advised me to send me the information where I will be doing most of my hunting (Montana) instead of where I did my testing (Minnesota). I'm having a brain fart trying to figure this out. If my 270WSM 150g AccuBond is going 2989FPS at 1300 feet of elevation, what will it be going at the muzzle at 6500 feet of elevation? I tried to look online for a conversion but couldn't find one. TIA. PS. If there is some sort of table please provide a link.
Convert fps at 1300 ft of elevation to fps at 6500 fps
- Thread starter Pineman
- Start date
ShootersCalculator.com | Ballistic Trajectory Calculator
Calculates the ballistic trajectory of a bullet fired from a rifle, handgun or other firearm. Produces a ballistic trajectory chart and table that shows the drop, velocity, kinetic energy, windage, and trajectory of a bullet.
How Altitude Changes Trajectory — Ron Spomer Outdoors
Altitude changes trajectory of bullets by altering air density, thus increasing or decreasing drag. But so does temperature, and the two are intertwined.
www.ronspomeroutdoors.com
Bruce Mc
Handloader
- Oct 26, 2005
- 1,279
- 623
I don't think altitude alters muzzle velocity.
RL338
Handloader
- Mar 23, 2017
- 3,369
- 5,491
This
As you go up in elevation the temperature comes down thus a decrease in velocity can be expected.
Bruce Mc
Handloader
- Oct 26, 2005
- 1,279
- 623
Temperature can impact how powder burns so it obviously effects muzzle velocity, so I agree with that statement. Altitude doesn't always equate to decrease in temperature.
TackDriver284
Handloader
- Feb 13, 2016
- 2,560
- 2,139
Temperature and altitude are related in that they both affect air density and therefore the ballistic performance of a bullet. Lower altitudes result in denser air, therefore more drag on the bullet and more bullet drop. Higher altitudes result in thinner air, therefore less drag on the bullet and less bullet drop.
The atmospheric pressure goes down as the elevation goes up. The lower pressure reduces the drag on the bullet and therefore the bullet retains more energy and velocity at longer ranges. The starting velocity doesn't change no matter the elevation, with all else being equal.
Bruce Mc
Handloader
- Oct 26, 2005
- 1,279
- 623
Temperature and altitude are counter to each other. A bullet drops less in higher altitude while lowering temperature makes the bullet drop more. You can drive yourself more crazy trying to figure out what you want on a custom dial.
- Thread starter
- #9
- Oct 30, 2004
- 24,344
- 3,185
It does not. It affects Ballistic coefficient which is based on altitude. The higher you are the less denser the air is.
Guy Miner
Master Loader
- Apr 6, 2006
- 17,793
- 6,036
Easy misconception.
At altitude your rifle will likely shoot flatter, because there is less drag, so the bullet retains velocity better. Muzzle velocity remains the same, but velocity at 300+ yards may well be noticeably faster & trajectory flatter.
I think we've all been saying this, in different ways.
Best of luck on your upcoming hunts! Guy
At altitude your rifle will likely shoot flatter, because there is less drag, so the bullet retains velocity better. Muzzle velocity remains the same, but velocity at 300+ yards may well be noticeably faster & trajectory flatter.
I think we've all been saying this, in different ways.
Best of luck on your upcoming hunts! Guy
RL338
Handloader
- Mar 23, 2017
- 3,369
- 5,491
This and Streloc Pro is what I use.
BC does change some but air density is more critical and has a larger effect. A bullets profile doesn't drastically change but how the air effects it does change with altitude/humidity/temperature.
flyingagg
Handloader
- Dec 16, 2019
- 462
- 479
NM
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