Ballistic calculator

[DDWing]

Can anyone help me out on a ballistic calculator that works correctly. I've tried half a dozen different one's, including Strelok, and none of them are even close to being correct. I've tried everything I know to get them to match the ballistics of my firearms, and they aren't even close. As much as 8"off at 300 yrds. Any help would be greatly appreciated.

 

[Deleted member 119066]

8" at 300 is incredible that's almost the entire drop of many cartridges zeroed at 100.

Give me a more detailed example of how the situation because I'm having a hard time understanding. I've literally taken box velocities on core lokt with the hornady app and been way closer than that

Do you have your actual BC or your bullet used and the actual muzzle velocity?

 

[DDWing]

8" at 300 is incredible that's almost the entire drop of many cartridges zeroed at 100.

Give me a more detailed example of how the situation because I'm having a hard time understanding. I've literally taken box velocities on core lokt with the hornady app and been way closer than that

Do you have your actual BC or your bullet used and the actual muzzle velocity?

I've input my information numerous times, and nothing works. I was shooting a 6.5 Grendel today, 100gr Lapua scenar, 2780mv, zeroed at 100 yrds, 6x24x50 moa scope. At 300 yrds strelok said to come up 1.8 moa, and it was 5.5 inches low.

 

[squeeeeze]

I prefer Shooter Ballistics. Strelok isn't too bad for a free ap. There's a lot of data that has to be plugged in correctly and precisely to be accurate. If you're off 8" at 300 yards then there's something inputted wrong.

As stated above, you'll need to post all your info that you input into the ap to start to diagnose. Make sure you get your zero distance correct and your scope height. Along with BC (G1/G7), MOA/Mil, Actual velocity, station pressure /zeroed environment etc.

 

[nealm66]

Without looking it up, 1.8 moa should have been pretty close?

 

[DDWing]

I prefer Shooter Ballistics. Strelok isn't too bad for a free ap. There's a lot of data that has to be plugged in correctly and precisely to be accurate. If you're off 8" at 300 yards then there's something inputted wrong.

As stated above, you'll need to post all your info that you input into the ap to start to diagnose. Make sure you get your zero distance correct and your scope height. Along with BC (G1/G7) Actual velocity, station pressure/zeroed environment etc.

I did all of that, but it still doesn't calculate correctly. If I set the calculator to show clicks, instead of moa, it says to come up 7 clicks, but I have to come up 13 to be in the bullseye.

 

[DDWing]

Without looking it up, 1.8 moa should have been pretty close?

It wasn't. The longer distance I shoot, the less accurate it becomes.

 

[squeeeeze]

I did all of that, but it still doesn't calculate correctly. If I set the calculator to show clicks, instead of moa, it says to come up 7 clicks, but I have to come up 13 to be in the bullseye.

What scope do you have? Any chance it's a 1/8" MOA adjustment and not 1/4" MOA? Or maybe not inputted (wrong default) correctly in AP?

 

[squeeeeze]

If you want to post all you information I'll make a profile and run it in shooter for you.

Here's my info I just created last night for a muzzy that I haven't shot yet to get an idea. I have a couple more details I'll add once I get to the range. Post ALL this info and we'll see how it compares to what you're coming up with.

 

[DDWing]

What scope do you have? Any chance it's a 1/8" MOA adjustment and not 1/4" MOA?

Its an Athlon Argos 6x24x50 MOA. It's definitely a 1/4 moa scope. I've tried these calculators with three different rifles, and they will not match up with any of them.

If you want to post all you information I'll make a profile and run it in shooter for you.

Here's my info I just created last night for a muzzy that I haven't shot yet to get an idea. I have a couple more details I'll add once I get to the range. Post ALL this info and we'll see how it compares to what you're coming up with.
View attachment 302872View attachment 302873View attachment 302874View attachment 302875
View attachment 302878

6.5 Grendel 20" proof research barrel
100gr. Lapua Scenar
Distance is 500 yrds
Altitude is 580
Pressure is 29.9
Temp is 79
Humidity is 52%
M.V. 2780
100 yrd zero
Athlon Argos 6x24x50 1/4"MOA
Scpoe height is 2.75
No wind, no angle
Shooting Nort/South

 

[DDWing]

Its an Athlon Argos 6x24x50 MOA. It's definitely a 1/4 moa scope. I've tried these calculators with three different rifles, and they will not match up with any of them.

6.5 Grendel 20" proof research barrel
100gr. Lapua Scenar
Distance is 500 yrds
Altitude is 580
Pressure is 29.9
Temp is 79
Humidity is 52%
M.V. 2780
100 yrd zero
Athlon Argos 6x24x50 1/4"MOA
Scpoe height is 2.75
No wind, no angle
Shooting Nort/South

BC is 385

 

[squeeeeze]

Its an Athlon Argos 6x24x50 MOA. It's definitely a 1/4 moa scope. I've tried these calculators with three different rifles, and they will not match up with any of them.

6.5 Grendel 20" proof research barrel
100gr. Lapua Scenar
Distance is 500 yrds
Altitude is 580
Pressure is 29.9
Temp is 79
Humidity is 52%
M.V. 2780
100 yrd zero
Athlon Argos 6x24x50 1/4"MOA
Scpoe height is 2.75
No wind, no angle
Shooting Nort/South

Shooter shows me elevation come up is 3.5MOA which is double what you're showing so sounds like this is close to what you're experiencing in the field.

I just left my windage in there and left my yards where it was.

You didn't post a twist rate so I guessed 1:8 for you.

The Lapua Website shows a G1 BC of .424 and a G7 of .212. Not sure about expanded values for different velocities though. If so the .385 may be closer to and past 300 yards? Either way it shouldn't vary much being zeroed at 100 and looking at drops at 300 yards.

Double check and make sure you haven't entered .385 in a G7 BC. Maybe try putting it in as .212 G7.

 

[asd9055]

BallisticAE uses a BC of 0.212 (G7)
at 300 yards it says 3.6 MOA
Assuming I am doing it right

 

[DDWing]

Shooter shows me elevation come up is 3.5MOA which is double what you're showing so sounds like this is close to what you're experiencing in the field.

I just left my windage in there and left my yards where it was. Maybe you're Strelok AP is set at 1/2" MOA for scope adjustment? Maybe the AP is set for a G7 BC? Something is definitely not correct though.

You didn't post a twist rate so I guessed 1:8 for you.

The Lapua Website shows a G1 BC of .424 and a G7 of .212. Not sure about expanded values for different velocities though. If so the G1 BC of .385 may be closer at and past 300 yards? Either way it shouldn't vary much being zeroed at 100 and looking at drops at 300 yards.
View attachment 302890
View attachment 302892
View attachment 302893

You are correct on the twist rate. I forgot to post it. I'll try the calculations that you came up with and see how they do. It will be tomorrow before I can shoot again. Thanks to you, and all that replied for your help. I'll post tomorrow, on my results.