• The Shot You’ll Never Forget Giveaway - Enter To Win A Barrel From Rifle Barrel Blanks!

    Tell us about the best or most memorable shot you’ve ever taken. Contest ends June 13th and remember: subscribe for a better chance of winning!

    Join contest Subscribe

Search results

Search the forum Search Articles
  1. BryanLitz

    Range Report Which Published Berger BCs Are From Predictions Rather than Measurements?

    Don't just race to the end. Remember I had to start by demonstrating that you were exaggerating the non-dominant sources to begin with. Prior to that, you were asking the question if the solver or the wind uncertainty was dominant. Then you moved to questioning the data, now that the...
  2. BryanLitz

    Range Report Which Published Berger BCs Are From Predictions Rather than Measurements?

    Frank, The answer to your question about why we continue to use BC's (G1 or G7) is two-fold IMO. 1. It's a single number which sums up bullet performance pretty well and allows for comparison. If you have a .30 cal 175 grain bullet with a BC of .475, and another .30 cal 175 grain bullet...
  3. BryanLitz

    Range Report Which Published Berger BCs Are From Predictions Rather than Measurements?

    And yet, As usual, YOU HAVE NO DATA to support your statement. Leave it to an MIT PHD to keep arguing about fractions of a % when actual shooting shows that uncertainty in the wind field is the dominant reason why we miss targets.
  4. BryanLitz

    Range Report Which Published Berger BCs Are From Predictions Rather than Measurements?

    Michael, Let's consider your most recent post as an example of your pattern to make misleading and exaggerated statements. Skin friction is affected by Reynolds number, which is affected by altitude. On this we agree. I recall running aero models on air-to-air missiles in the Air Force in...
  5. BryanLitz

    Range Report Nosler LR Accubonds: BC testing results

    Yes, it sure does. You can explore the effects for your specific rifle and bullet using the Berger online calculator: http://www.bergerbullets.com/twist-rate-calculator/ Also, if you're really interested in more in-depth information on how twist rate affects BC, accuracy, velocity, etc...
  6. BryanLitz

    Range Report Which Published Berger BCs Are From Predictions Rather than Measurements?

    My skepticism grows when I see your name. A bullet aligning it's axis with the oncoming airflow is simply what happens with stable projectile flight. A crosswind acts to mis-align the bullets axis and drag vector with the line of sight. From here it's simple vector math to show what portion...
  7. BryanLitz

    Range Report Which Published Berger BCs Are From Predictions Rather than Measurements?

    It's as accurate as F=MA. It's a direct calculation. The only uncertainty is knowing the actual wind, and that's a measurement challenge. Michael, more than 7 years worth of experimental information has been shared on a public forum, for free, by someone who's been working in the field for...
  8. BryanLitz

    Range Report Which Published Berger BCs Are From Predictions Rather than Measurements?

    You want a fine example of capitalism, it's getting research funded by the US Air Force to study varmint bullets. But your business model relies on this. You actually convinced the govt to fund your research into high altitude aerodynamics (on varmint bullets of course); in particular the...
  9. BryanLitz

    Range Report applied ballistics 260 help?

    You have several replies to your question over on the AB Kestrel thread, did you see them?
  10. BryanLitz

    Range Report Applied Ballistics Kestrel; Pro staff support thread

    Powder temp is just referring to how hot your ammo is. Powder burns faster and generates higher MV when it's hot. The two inputs in the app (MV variation and powder temp) work together to correct your MV based on temperature. For example, if you measured your MV to be 2650 fps at 60 degrees...
  11. BryanLitz

    Range Report Applied Ballistics Kestrel; Pro staff support thread

    Applied Ballistics Kestrel Support Videos Considering the vast network of support utilities available for the AB Kestrel, I've created a few short instructional videos to provide some guidance as to their intent, set up, and use. Here's a snapshot of what I mean by 'Network' of utilities...
  12. BryanLitz

    Range Report 6-dof

    woostri, I also wrote my 6-DOF from McCoy, and validated with his 168 SMK aero. In my previous job (Air Weapons modeling and simulation with the US Air Force) I had access to some aero prediction codes such as MISSILE DATCOM, PRODAS, and AP98. In my current job (Chief ballistician for Berger...
  13. BryanLitz

    Range Report Nosler LR Accubonds: BC testing results

    Mountain Shooter, Good observation, there are a couple things going on here. One is that the actual length of the bullets I shot measured 1.519", as opposed to the 1.49" listed by Nosler. I show Noslers length in my table because that might be a more representative length across all lots, but...
  14. BryanLitz

    Range Report Nosler LR Accubonds: BC testing results

    The G7 BC's I'm reporting are always averaged between 3000 and 1500 fps.
  15. BryanLitz

    Range Report Applied Ballistics Mobile now available for iPhone

    Yes, we have that one. Here's the list:
  16. BryanLitz

    Range Report Applied Ballistics Mobile now available for iPhone

    Guys, We're working on correcting all the known bugs and will be pushing an update soon which addresses them. Below is a list of the bugs which are fixed in the update. If you're having an issue, please check and see if it's on the 'fixed' list prior to posting. If your bug isn't listed...
  17. BryanLitz

    Bearing Surface to Twist Rate

    This should help: http://www.bergerbullets.com/twist-rate-calculator/ Also, don't take for granted that your 'specified' barrel twist; you have to measure to be sure. -Bryan
  18. BryanLitz

    Range Report Applied Ballistics Mobile now available for iPhone

    We're looking in to the weather auto update as to requirements, settings, etc. It works on my iPod so I can't troubleshoot. I'm thinking that in addition to gps (which just provides location) you may need to have some kind of data signal as well so the phone can know the weather at that...
  19. BryanLitz

    Range Report Applied Ballistics Mobile now available for iPhone

    Those are the recommended ranges for optimal ballistic calibration based on where the bullet is in the Mach spectrum for best results. If you can't get within those ranges, it will still calibrate, but you want as much distance between points as possible. IF you do a good calibration at 800...
  20. BryanLitz

    Range Report Applied Ballistics Mobile now available for iPhone

    The android and iOS sync features don't talk to each other.
Top Bottom
Back
Home
Forums
Merch
Alerts