Jbm ballistics and litz's bc values have been spot on. I have on more than one occasion used his program to build a chart the night before a match, and did well. as long as you have the correct information going in you will have correct information coming out.
1230 yard range report
- Thread starter shoots_5
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Desert Fox
Handloader
- Aug 14, 2006
- 1,965
- 5
I've got 34.97 MOA come-up on elevation at 1225 yards so 35.0 would be at 1230 yards and 3.67 on wind at 2 o'clock.
Was that your actual dope or you have to tweaked it?
Was that your actual dope or you have to tweaked it?
- Thread starter
- #24
DF, 35.5 was what got hits. I had my muzzle velocity at 2770 to start with and my calculator gave me 34.5 to start with. I made the adjustment and then adjusted my MV in the program until the actual dope lined up with the program which ended up being a velocity of 2731. As for wind, there was at least 3 different winds between me and the target. But between wind and spin drift it ended up being a full 4 MOA left hold. Wind was from 2 o'clock where we were, but then coming down canyon from 9 o'clock through the big canyon and was pretty swirly near clump of trees at the target. If you watch the dust from the first shot on the video you'll see it drift left to right then swirl back out into the field and come back the opposite direction! My first shot was about 12 feet right because I held into the wind I was feeling from 2 o'clock... As frustrating as it is sometimes shooting in the wind, the experience and learning are always valuable!
- Thread starter
- #25
Here's another little video from the same day. Warmed up on a 10" steel target at 784 yards before switching to the really long range targets. I'm always amazed at the energy this round still has at extended ranges...even with this half inch steel target on a swinger at that range it still leaves a pretty good mark in the steel!
http://m.youtube.com/watch?v=G5eiGQwd2Oc
http://m.youtube.com/watch?v=G5eiGQwd2Oc
Desert Fox
Handloader
- Aug 14, 2006
- 1,965
- 5
What is your actual elevation where you're shooting. If you use station pressure, you can be off by a lot since that was probably taken far away from you.
It is important also to know your bullet spin drift. If your ballistic program doesn't have that feature, you can just shoot at 600 yards and measure the drift that way.
Measuring bullet spin drift is one feature from Ballistic FTE that I really like, because it's factored into the program. All you need is the actual measurement of the bullet length and the barrel twist and the program will calculate it for you in correlation with wind direction and wind drift. Great stuff.
It seems like you're shooting downhill. If this was the case, you need to factor that also.
It is important also to know your bullet spin drift. If your ballistic program doesn't have that feature, you can just shoot at 600 yards and measure the drift that way.
Measuring bullet spin drift is one feature from Ballistic FTE that I really like, because it's factored into the program. All you need is the actual measurement of the bullet length and the barrel twist and the program will calculate it for you in correlation with wind direction and wind drift. Great stuff.
It seems like you're shooting downhill. If this was the case, you need to factor that also.
- Thread starter
- #27
I measured the station pressure at my location using my kestral so that should be spot on...but it's about 1650' in elevation. And the Applied Ballistics program does give the option to incorporate spin drift. My barrel is a 1:9 twist right, and according to the program would be a Left 0.8 MOA hold for spin drift with zero wind at 1230 yards.
The one option that I didn't think to turn on until after I was done shooting was the coriolis effect option...not sure how much difference it would have made but probably starting to get out far enough that I should think about it....
The one option that I didn't think to turn on until after I was done shooting was the coriolis effect option...not sure how much difference it would have made but probably starting to get out far enough that I should think about it....
Desert Fox
Handloader
- Aug 14, 2006
- 1,965
- 5
Coriolis is negligible. Even at that distance the coriolis is probably no more than .20 MOA.
- Thread starter
- #29
Next time I'll have to see what the difference in predicted dope is with it on vs off...
According to my program at that range the bullet should have hit at 1602fps with 1710 ft/lbs of energy and flight time was 1.765 seconds. I know on the first shot I fired, recovered from recoil and thought huh, wonder where I hit I didn't see any splash....then the bullet hit and I thought holy crap, that's a long freaking ways! Can't freaking wait to get out somewhere where I can attempt some shots at a mile! At that range the predicted flight time is 2.9 seconds....with some practice I bet I could get another round in the air before the first one landed.... :twisted:
According to my program at that range the bullet should have hit at 1602fps with 1710 ft/lbs of energy and flight time was 1.765 seconds. I know on the first shot I fired, recovered from recoil and thought huh, wonder where I hit I didn't see any splash....then the bullet hit and I thought holy crap, that's a long freaking ways! Can't freaking wait to get out somewhere where I can attempt some shots at a mile! At that range the predicted flight time is 2.9 seconds....with some practice I bet I could get another round in the air before the first one landed.... :twisted:
- Nov 4, 2004
- 27,124
- 13,624
Looks like you hit the 784 yd plate pretty good. Nice shooting!
I agree with you, down range energy is impressive.
JD338
I agree with you, down range energy is impressive.
JD338
- Thread starter
- #32
Guy Miner
Master Loader
- Apr 6, 2006
- 18,249
- 8,440
Good shooting!
.300winmag
Handloader
- Oct 17, 2011
- 660
- 2
Shoots;
What's your rough Latitude and azimuth, I can run the Coriolis if you'd like, it is probably only a 1/4 MOA but it's still interesting to see what the numbers should be.
What's your rough Latitude and azimuth, I can run the Coriolis if you'd like, it is probably only a 1/4 MOA but it's still interesting to see what the numbers should be.
- Thread starter
- #35
.300winmag
Handloader
- Oct 17, 2011
- 660
- 2
I got .3 MOA as well
Desert Fox
Handloader
- Aug 14, 2006
- 1,965
- 5
Yep!Elkman":1fr8b6ve said:
1332 yards was the farthest I've shot with my 338 Lapua Ackley. I was aiming at a tiny rock right at 1.5 Mil in the picture. It took me 4 shot to hit it. I did not account for wind, spin drift and Coriolis. I found out later that the wind really was the culprit.
I plotted my shot using google earth just to get perspective.
- Thread starter
- #38
That's pretty cool plotting it on google earth....would be a good way to study how the terrain is affecting the winds for sure! I'm going to have play around some with that. And I've seen that picture through your scope before on another, more populated forum....
- Thread starter
- #39
Pretty danged excited this morning....got to witness an amazing athletic feat last night as I get to work with one of the top rated high school recruits in the country who broke some amazing records last night running for 643 yards and 10 TD's in a single game! He now has over 1200 yards rushing in 3 games so far this season....
Then this afternoon I get an opportunity to go do some shooting with a former Marine Recon Scout Sniper! So excited to be able to learn a few things from such a highly trained individual!!! Minus the 4 hours of sleep last night....this is going to be a good day!
Then this afternoon I get an opportunity to go do some shooting with a former Marine Recon Scout Sniper! So excited to be able to learn a few things from such a highly trained individual!!! Minus the 4 hours of sleep last night....this is going to be a good day!
DrMike
Ballistician
- Nov 8, 2006
- 38,190
- 8,289
Not a bad twenty-four hours. Good on you!
