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Forensic Ballistics and Explosives: Questions 1-5 of 87. Average 100 yard groups are .310" and .430"@ 200. So a 1:10” twist is slower than a 1:8” twist, a 1:12” twist is slower than a 1:10” twist, and so on. B A B A B Broach cutter used to create rifling impressions in a barrel. A friend recently purchased a 6.5 creedmore. Forensic Ballistics is the analysis of evidence relating to firearms involved in a crime, this includes the effect and behavior of projectiles such as bullets and explosive devices. Roughly a third of the questions are about projectile types and bullet construction. 10: Those slots are there to help vent and cool the rifle barrel during firing. Short Barreled Rifles (SBR’s) are classified as rifles with a barrel shorter than 16” and/or an overall length shorter than 26”. You don’t need a lot of technical knowledge. Longrange barrels are typically 18 or 20 inches long, while short barrels are 14.5 inches or shorter. Both of them topping out over the 6.5. 2) The GS bullets use a longer COL than the XTP bullets; this opens up … Get to the point NTA-NET (Based on NTA-UGC) Forensic Science (Paper-II) questions for your exams. Free Online Library: Firearms identification - "ballistics". Answers to some common questions about relief from firearms disabilities, the Gun Control Act (GCA) and regulation of firearms and ammunition. While the XTP bullets appear to have a thicker jacket as well as a much longer bearing surface. Shorter barrels are more suited for closer engagements due to their length and lighter weight, but they are not as accurate at long range. If your FPS is for example 2750 FPS and your ammo temp. • The National Integrated Ballistics Information Network, NIBIN, produces database files from bullets and cartridge casings retrieved from crime scenes or test fires from retrieved firearms, often linking a specific weapon to multiple crimes. Firearms examiners also do ballistics. WOUND BALLISTICS REVIEW -----1 on the ammunition always going to be a constant, not including other factors such as fouling and bore erosion? Values are based on the actual condition of the firearm and whether any modifications have been done to it, such as re-bluing or drilling and tapping for scope mounts, etc. It defaults to rifle, but switch the window to shotshell and then select ducks in the use window and it will pull up all of the federal offerings with ballistics -- both 20 and 12 gauge. Answered by: P. T. Kekkonen ... was not uncommon that some manufacture assembled some models of firearms but the parts (including barrels) were made by another arsenal, owing more production capacity of these parts. Frequently Asked Questions About Ammo: Part 1; Frequently Asked Questions About Ammo: Part 1 ... the invention of jacketed bullets allowed ammunition and firearms manufacturers to produce bigger and faster ammo. The history of Forensic Ballistics or Ballistic Fingerprinting is a rich portrayal of how elementary techniques used by forensic investigators to evaluate crimes involving the use of guns and other firearms evolved over time to encompass more sophisticated methods for criminal investigations involving firearms. A discipline mainly concerned with determining whether a bullet or cartridge was fired by a particular weapon. And it’s not all about flight ballistics. Whatever light you can shed on this issue 4 wound ballistics. I’m using the Federal Ballistics Tables (on-line) to provide some answers. (originally published in Journal of the American Institute of Criminal Law and Criminology, vol. 1) The GS bullets do have a shorter bearing surface reducing friction and lowering pressure. Firearms Identification. ... so it takes a long, long time to wear out a handgun barrel. A forensic ballistics expert matches bullets, fragments, and other evidence with the weapons of alleged suspects or others involved in … My friend says he believes these numbers to be made up. The AR pistols generate quite a few questions, specifically regarding velocity loss from the much shorter barrels. The temperatures effect on a bullets muzzle velocity. Barrel -A) Land -B) Groove Bullet -A) Land impression -B) Groove impression Rifling the spiral grooves that are formed in the bore of a firearm barrel. Generally, fast twist barrels are used for longer bullets while slower twist barrels are used for shorter bullets. caused by the temp. I don't expect answers to these questions one-by­ one. 21 Important Questions & Answers About the AK-47 Question No. Two is the standard, but in some countries the handguards are longer (the former Yugoslavia and Iraq being two examples). The 7.62 X 39 is one of the most common rifles available. The 6mm with high BC bullets is highly predictable out to 850 yards but the little .223 bullets can hit too as long as you know how to do it. Forensic ballistics is the examination of evidence relating to firearms at a crime scene, including the effects and behavior of projectiles and explosive devices. Like most things in life, the answers lie somewhere in the middle. Accuracy Answers. Here you will find hunting, fishing, and survival tips from the editors of Field and Stream, as well as recommendations from readers like yourself. If this is your first visit, be sure to check out the FAQ for information on posting and navigating the forums. Their owner’s estimates vary wildly from a few hundred feet-a-second less than the 24-inch test barrels to as much as a fifty percent loss. Is that a constant? BALLISTICS + FIREARMS Use this link –bit.ly/ballisticsvocab-to complete the vocabulary matching below by writing the letter of the definition next to the correct vocabulary word. 16 inch barrels tend to be a good all-purpose length. Standouts included Federal’s hollow-point Hunter Match and round-nosed Auto Match, although the 20.5-inch barrel proved compatible with a wide variety of ammo. I am shooting 62 and 77 grain bullets in my 20" Stainless Steel HBAR with a 1-8 twist. ARX Reloads in 9mm, 380, 45-70 & 7.62 X 39. • It is important to remember, however, that the ultimate decision for making a final comparison and ambient temp. are both 70deg F. At 60deg F or 80deg F is the increase or decrease in M.V. When most firearms are fired, these tool marks are transferred to the discharged ("spent") cartridge casings and bullets. If a bullet has a twist recommendation of 1:10”, it will be stable when fired from any rifle having a 1… Welcome to Field and Stream's Answers section. Krieger Barrels manufactures custom, single-point cut-rifled barrels for bolt action, AR-15, AR-10, M1 Garand, M14, M1903 along with a … Shooting started with the CZ 20.5-inch barrel that came on the rifle. The 500 yard drop reads 49 inches. A 1-8 twist is fine for a 77 grain round, but if there is a 1-7 available I would get it. Examiners commonly have to ; Analyze bullets and shell casings found at a crime scene to determine what type of weapon fired them ; Help with crime-scene reconstruction by estimating the distance between the gun muzzle and the victim or by working out the trajectory of the bullets. General Questions - Explosives These questions are intended to help you gain a better understanding of explosives-related issues. Some bullets couldn't hit the chart, size 1 x 1 meter at 50 meters distance. 24, p. 825, 1934, Reprint) by "Journal of Criminal Law and Criminology"; Ballistics Testimony Evidence (Law) Laws, regulations and rules Evidence, Expert Evaluation Evidence, Scientific Expert evidence Scientific evidence (Law) That would presume that the questions were in­ dependent of each other and required (or deserved) separate answers. Lilja Rifle Barrels, Inc. does not make or sell SBR’s but we do make sub-16” long barrels for AR type rifles. Llama & Ruger were my two test handguns used. You can do the same thing at this link. In my post of June 11, I told you about shooting my Savage .25/06 at 350 yards, and how the heavier, 115-grain bullets I used shot flatter than the faster 85-grainers. Included Federal’s hollow-point Hunter Match and round-nosed Auto Match, although the 20.5-inch barrel proved with! 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