Advanced Ballistics SDI Questions and Answers Graded A+

Advanced Ballistics SDI Questions and Answers Graded A+ After a bullet leaves the rifle barrel, what two forces act on the bullet's trajectory? Gravity and the force due to the air flow around the bullet. What is "start pressure?" The amount of pressure necessary for the bullet to overcome the initial forces of friction What is always the first consideration when reloading any cartridge? Safety The cleaning of the primer pocket cannot be done until the primer is removed. True What is a major consideration when beginning to prime? All the above Which of the following is one of the most important concepts in successful shotshell reloading? Carefully following instructions What is the primary function of the hull? To package the powder and shot in a neat, complete unit Which of the following measures the radial run out of a finished round? A concentricity guage Name three popular brands of shot gun reloading presses on the market today. Lee Precision, Mayville Engineering, and Hornady Which of the following is a form of smokeless powders? Thin circular flake or wafer Cylindrical shape Small sphere Which of the following indicate the types of shotshell presses available? Single-stage and progressive When using a progressive shotgun press, if the primer is not fully seated and sticks out, what is the first remedial action you should take? Attempt to reprime again Ballistics deals with The science of moving projectiles When shooting uphill, the gun will shoot High In order to achieve optimal rifle accuracy, it is recommended that the reloader purchase a Concentricity According to the author, about _____ rounds should be initially used to test the projectile that you have created. 120 Matching question. Match the terms of trajectory to the labels indicated in the picture below: G- zero range E- mid range height C- line of departure A- sight height F- baseline D- projectile trajectory B- line of sight The ballistic pendulum was based upon laws of mechanics formulated by: Sir Isaac Newton Increasing neck tension can sometimes obtain more uniform pressure and velocities. True Which of the following is true about promotional loads? They are cheaper rounds designed for one time use Who invented the ballistic pendulum in the year 1740? Robins The sizing die is ________ and needs to be fitted into an appropriate reloading press. None of the above What is case obturation? The ability of a case to expand and then return to its basic shape For most presses with the priming feature, which way should the primer anvil be facing? It should be facing up Which is typically the first step in reloading in which a die is used? Resizing the case to a reusable state The Hornady concentricity tool is useful due to the ability to bump ammo but cannot help with troubleshooting. True Achieving the proper COL for the combination of bullet, case, primer, and powder specified in the data manual will ensure safety, accuracy, and proper function. True Which of the following should not be done with a carbide die? Cam-over ------ is defined as the maximum PSI below which you can safely operate, and above which you can anticipate trouble: Service Pressure What is the altitude used for most ballistics tables? Sea level What is the proper name for a bullet tip The meplat A bullet's reaction to wind depends on what two factors? Speed and direction of the wind Which of the following is a difference between shotguns and rifles? Typical muzzle velocity What is one of the effects of a cartridge that is filled with too little powder? Weak and uneven powder burn When sorting brass, what should you do if cracks, splits, or head separation is detected? Discard it What is a major consideration when beginning to prime? Only use the primer brand and size specified for the load you are using Verify there are no crimps in the case Wear safety glasses ***All of the above*** If the desired effect is to use a hunting load that will touch the lands of the rifling , you must create good __________ and a nicely _________. Case tension; polished throat. Traditionally, lead pellets contained both _________ and _________. arsenic; antimony What must be done after any trimming operation? Deburring the inside and outside of the neck with a chamfering tool The dent, coming from the firing pin striking the metal side of the primer, creates the pressure needed to ignite the priming mixture. True Which press is essentially single-stage but can be mounted with various dies at one time? The turret After trimming, priming, and loaded the case with powder, what is now needed in your press? The seating die If your rifle is shooting 1.5 MOA, a technique like flash hole uniforming can make big changes in accuracy. False The shellholder is specific not to caliber, but rather to the dimensions of the case head. True Which of the following can be rolled into a cylindrical shape around a slug and inserted into the hull? Teflon wrap Which of the following indicate the types of shotshell presses available? Single-stage and progressive During the ------- operation, obturation presses the sides of the cartridge against the walls of the die. Neck sizing The measurement for overall case length is taken from the flat of the case head to the opening of the case mouth, and the length is always expressed as a maximum dimension less _____________. Ten-thousandths of an inch If the temper of the brass is poor and leads to split neck cases, what remedial action should take place for the remainder of the cartridges in the bin? The reloader must anneal the remainder of the brass. What will adding weight to your gun help with? Reducing recoil To achieve proper obturation on a resized case, it is preferable to focus on the dimensions of a minimum chamber specification, one that has only the slightest clearance needed to easily and safely chamber the round. True For extreme accuracy, cartridge run out should be kept to: .001 inch Which reloading scale is accurate, inexpensive, and not affected by changes in atmospheric pressure? A beam scale Which of the following seals the powder away from the shot and prevents the burning gases from leaking through the balls of shot? Wads Shotshell reloading has become more relevant than ever due to the availability of lighter loads, non-toxic loads, and a variety of hulls. True For greatest potential accuracy, after you have separated the brass that was fired from your own gun from that which was otherwise procured, what is the next step? Sorting by manufacturer Full-length sizing die setup begins by inserting the ______ into the top of the press's ram. Shellholder What will using the dial or electronic caliper and measuring the case from the meplat to the flat of the case head where the primer is located do? It will give you the COL measurement of the loaded round after soft-seating For extreme accuracy, it is a good practice to uniform the flash hole, even on new brass. True Where no data exists for a given bullet weight, it is sometimes possible to interpolate book data using the 1 grain of powder per 10 grains bullet weight. True Who was the first person to prove that trajectory is a curve, and not a straight line? Tartaglia We want to see something measurable when manipulating barrel harmonics by adjusting seating depth. Therefore, there is not much point in adjusting the jump by a very small fraction What does a shotshell checker do? Measures the precision of hulls and reloaded shells Which of the following statements is false? Filler wads in the base of the shot cup are indispensable to the reloader Standard options for shot include --- Size and composition What is the name for backing off the ram slightly and screwing in the die an additional 1/8- to ¼-turn? Cam-over Variations in brass weight can cause both __________ and _________. Case capacity; pressure problems. The sizing die is ________ and needs to be fitted into an appropriate reloading press. Cartridge-specific True or false: A shorter bullet is generally more stable when traveling through the bore. False If you are using "range brass," what must you make sure of before reloading? How many times its been fired That the cases are the correct chambering for your gun Check the headstamp for caliber designation ***Both B & C*** During case preparation it is important to ------ of the above the flash hole. Uniform Which press is the predominant choice among shotgun reloaders? The progressive pressq The two fundamental designs of plastic hulls in use today are a two-piece straight-sided hull and A one‑piece, injection‑molded, compression‑formed hull Cartridge overall length is not important to safe functioning of your reload in your firearm. False Which of the following is the last step in the reloading process? Marking the ammo In what type of terrain are vertical winds usually encountered? Mountainous or hilly areas What is the effect that is caused by too much copper fouling in the bore? The bullet loses stability in flight and can cause wide fliers. Many authorities believe American shooters consistently use buckshot that is too small for the required shooting task. False The star fold crimp style demonstrates greater load-to-load consistency of tested speeds and pressures. . False Despite the extreme stresses places on cases, because of obturation, previously fired brass cases do not require special preparation before being reloaded. False Which of the following allows great precision in your powder loading? A powder trickler Before you size the first case, what must be done to prevent the decapping pin retainer from bottoming out and bending the rod? Adjusting the depth of the decapping pin's travel and thus the length of its rod What is the name of the test data, compiled in Germany in 1881 that turned out to be the basis for ballistics tables for small arms right up to the present time? Krupp test data Dents in the case shoulder are caused by all of the following except: Improperly trimmed cases. What process could cause live primers to detonate? (choose all that apply) Re-priming & De-priming Which process compresses metal and reforms it to a specified dimension? Resizing Though some shotguns are capable of more, most are most effective under ----- yards 100 yards The primary advantage of a Progressive press is: Higher rate of cartridge assembly compared to single stage press What is the preferred shape of shotgun pellets? Round