Once we know the time of travel number of pulses and the distance the screens are apart, the computer in the chronograph can easily calculate and display the exact speed of your bullet. The computer can also display a number of other data results for multiple shots strings such as Highest, Lowest and Average velocity, Extreme Spread, Power Factor and Standard Deviation. A string is a series of shots it can be 2 or or any number in between and for each string a variety of different data can be derived Extreme Spread — the difference between the fastest and slowest.
This requires the bullet weight to be entered maually. Thus, Standard Deviation is a universal method in statistics and measurement for dealing with and interpreting data.
Nearly all of them Standard Deviation is the most important information your chronograph can give you and it is useful to understand the reason for this. It is a measure of how consistent your ammunition is and reflects on the quality of your reloading.
At least ten 10 shots are required to obtain a reliable average and Standard Deviation. The spread between the existing brands of chronographs on the market today is approx.
This has a lot to do with the quality of the sensors used and the distance in which the sensors are spaced apart. The expected accuracy of the clock circuit is very high better then People claim very high accuracy with a single shot or reading but you cannot prove it.
The problem error caused by the sky screens spacing and the cone angle of the lens can be greatly reduced by increasing the screen spacing. Minimum spacing of 1 foot is not desirable; minimum spacing of 2 feet is recommended, Spacing of 4 feet is suggested for competition.
A simple way is to put two chronographs inline and fire a series of shots. If during the competition the chronograph is challenged or damaged, the other is available for cross checking. If they do not agree, then you need a third chronograph to determine which is the faulty one, and use the two that tend to agree.
See All Other Magazines. See All Special Interest Magazines. All Guns and Ammo subscribers now have digital access to their magazine content. This means you have the option to read your magazine on most popular phones and tablets. To get started, click the link below to visit mymagnow.
Get Digital Access. Subscribe To The Magazine. More Articles From Accessories. May 02, By Patrick Sweeney. Enjoy articles like this? Subscribe to the magazine. Subscribe to the Magazine.
Sign Me Up. Craig Boddington. What's Causing the Ammo Shortage? Eric R. Kyle Lamb. Springfield Emissary Gear Springfield Emissary Rare Breed Triggers vs. See All Videos. Buy Digital Single Issues. Don't miss an issue.
Buy single digital issue for your phone or tablet. Gun Dog Subscribe. Florida Sportsman Subscribe. This model displays the speed of each shot on the screen and records it along with the exact specs of the load you were using and the environmental conditions present at the shot. From assembling and using a chronograph all the way up to reading and recording your results, learning the ins and outs can be daunting.
Look for chronographs with single-button operation for simplicity of use and a fast learning curve. Chronographs that pair with iPhones and Android handheld devices, and whose batteries can be replaced without the use of extra tools, also get high marks. Most models from top manufacturers are accurate to within a few feet per second and will measure velocities for relatively slow and very fast bullets. When a shooter is serious and wants precision, that shooter wants to eliminate as many variables as possible, and to eliminate any uncertainty.
Well said. You are arguing against a point I never made. I know margins of errors can be cumulative, or even multiplicative. What I am pointing out, is just the magnitude of the errors that comes from tilting your device. Furthermore, I did say we wanted to eliminate all errors and I am simply quantifying what you can hope to gain from leveling you device. Pingback: Questionable chronograph readings?
Share Facebook Twitter Pinterest. Cal is a life-long learner, and loves to help others get into this sport he's so passionate about. His engineering background, unique data-driven approach, and ability to present technical and complex information in a unbiased and straight-forward fashion has quickly caught the attention of the industry.
For more info on Cal, check out PrecisionRifleBlog. Next Custom 7mm Rem Mag. Unclenick December 5, at am. Cal December 5, at am. JCS February 1, at pm. Cal February 1, at pm.
Unclenick February 23, at am. Cal February 23, at pm. CR Rains October 5, at pm. Cal October 6, at pm. Nick October 14, at pm. Cal October 14, at pm. Jeff August 31, at pm. Cal September 1, at am. Jeff September 1, at pm.
Michael Romano November 15, at am. Cal November 16, at pm. Michael Romano November 17, at pm. Kasper November 25, at am. Cal November 25, at pm. Kasper November 26, at am. Michael Romano November 28, at pm. Cal November 29, at pm. Kasper November 30, at am. You may share excerpts up to words, provided that full and clear credit is given to PrecisionRifleBlog. Absolutely no photos, charts, illustrations, or other images or videos may be reproduced, distributed, transmitted, or referenced without prior express and written permission from the author.
0コメント