A reserve price is the minimum price the seller will accept. This price is hidden from bidders. To win, a bidder must have the highest bid and have met or exceeded the reserve price.
$3.00 first class shipping in U.S. and rest of world.
Includes the Adobe Acrobat Reader for reading and printing publications.
Numerous illustrations and matrices.
Contains the following key public domain (not copyrighted) U.S. Government publication(s) on one CD-ROM in both Microsoft PowerPoint and Adobe Acrobat PDF file formats:
TITLE: SITE ADJUSTMENT AND ZERO, 54 pages (slides)
SLIDE TOPICS, SUBTOPICS and CONTENTS:
SIGHT ADJUSTMENT AND ZERO SOTIC
A precise zero of the sniper weapon (SWS) is critical to a sniper because errors at short ranges subtend to far greater errors at increased distances. Since a sniper deals with greater ranges , his zero of the SWS at short and long ranges is critical. It is one of the few variables he can control. Additionally, once he detects an error, he must be able to make the right correction instead of guessing it or bouncing around a target. This is particularly important when correcting for a miss when he only has a short time for a second shot. ZERO THE ALIGNMENT OF THE SIGHTS WITH THE BORE OF THE RIFLE SO THE BULLET WILL IMPACT ON THE TARGET AT THE DESIRED POINT OF AIM. THE WEAPON IS ZEROED WHEN THE SIGHTS AND THE TRAJECTORY COINCIDE DOWN RANGE AT THE POINT OF AIM. MINUTE OF ANGLE (MOA) MINUTE OF ANGLE & HOW IT IS IMPORTANT TO THE ART OF SNIPING MINUTES OF ANGLE MUST BE UNDERSTOOD TO ACHIEVE ZERO 1 MOA IS EQUAL TO 1/60th OF 1 DEGREE OF ARC. THE MOA ACTS THE SAME AS THE MIL RELATION FORMULA. EXAMPLE - 1 MIL AT 1000 METERS EQUALS 1 METER, AT 2000 METERS 1 MIL EQUALS 2 METERS. MOA A MOA SUBTENDS TO 1.047 INCHES AT 100 YARDS. LIKE THE MIL, THE MOA SIZE INCREASES UNIFORMLY OVER RANGE, BUT ITS VALUE, AS A MOA STAYS THE SAME. EXAMPLE 1 MOA AT 100 YDS = 1.047 IN 1 MOA AT 200 YDS = 2.094 IN MOA VALUE OF A MOA, WHEN USED IN THE FIELD OR ON THE RANGE, IS - 1 MOA = 1 INCH PER 100 YARDS WHEN USING THIS METHOD, THE ERROR IS LESS THAN 0.5 INCHES AT 1000 YARDS. MOA A MOA AT 100 METERS = 2.87 cm A MOA AT 200 METERS = 5.76 cm AGAIN ROUNDING PRODUCES A MOA AT 100 METERS = 3 cm, etc. AGAIN, THIS ROUNDING CREATS LESS THAN A 1.5 CM ERROR AT 1000 METERS FINAL FIELD ROUNDING A MOA AT 100 METERS OR YARDS EQUALS 1 INCH THIS CAUSES AN ERROR OF SLIGHTLY MORE THAN 0.5 INCHES AT 900 METERS OR 1000 YARDS DETERMINING TARGET SIZES AT DIFFERENT RANGES YOU MUST KNOW YOUR TARGET SIZE IN INCHES OR CENTIMETERS TO DETERMINE PRECISE CORRECTIONS FOR YOUR IRON SIGHTS OR OPTICS TO DETERMINE THE SIZE OF YOUR TARGET IN MOA, YOU MUST SIMPLY KNOW THE SIZE OF YOUR TARGET IN INCHES. DIVIDE THAT VALUE BY THE VALUE OF 1 MOA AT THAT RANGE. TARGET SIZE IN MOA E TYPE TARGET IS 19 INCHES WIDE, ITS PLACED OUT AT 500 METERS 19/5 = 3.8 MOA WIDE TARGET SIZE IS 36 INCHES HIGH AT 600 METERS 36/6 = 6 MOA HIGH THE MIL MILS FUNCTION THE SAME AS MOA 1 MIL EQUALS 3.375 MOA AGAIN ROUNDING ALLOWS FOR: 1 MIL EQUALS 3.5 MOA THIS CAUSES AN ERROR OF SLIGHTLY MORE THAN 1.0 INCH AT 900 METERS OR 1000 YARDS MILS REMEMBER, 3.5 IS IN THE FIELD - WRITTEN 1 MIL = 3.375! TO DETERMINE TARGET SIZE IN MILS, YOU MUST KNOW THE TARGET WIDTH IN MOA. TO DETERMINE WIDTH IN MILS SIMPLY DIVIDE THE TARGET WIDTH IN MOA BY 3.375 FBI TARGET IS 3.8 MOA WIDE AT 500 YDS 3.8 / 3.375 = 1.125 MILS WIDE TO ZERO YOU MUST GROUP!!! UNDERSTANDING MOAs AND MILs IS IMPORTANT YOU MUST ALSO UNDERSTAND GROUPING ASSESS & ANALYZE A GROUP: GROUPING IS DEPENDENT ON SEVERAL FACTORS. SHOOTERS ABILITY TO GROUP (MOST IMPORTANT) AMMUNITION GUN ENVIROMENTAL CONDITIONS MEAN POINT OF IMPACT YOU MUST DETERMINE THE MEAN POINT OF IMPACT (MPI) OF A GROUP. THIS IS THE POINT THAT IS THE CENTER OF ALL SHOTS, EXCLUDING CALLED FLYERS. A CALLED FLYER IS WHEN YOU CALL THE FLYER IMMEDIATELY AFTER THE SHOT, NOT AFTER YOU SEE THE TARGET. A TRUE GROUP MUST CONSIST OF A MINIMUM OF 5 ROUNDS 100 ROUNDS IS THE “STANDARD”
SHOT GROUP POTENTIAL .5 MOA GUN + .5 MOA AMMO + .5 MOA SHOOTER = ? (.5 X .5) + (.5 X .5) + (.5 X .5) = .75 SQUARE ROOT OF .75 = .866 MEAN MOA REASON FOR MANY UNCALLED FLYERS CALL EACH SHOOT THIS WAY YOU WON’T BE ANNALYZING A PULLED SHOT AS PART OF YOUR GROUP. SIGHT CORRECTIONS WHAT YOU MUST KNOW BEFORE YOU CAN MAKE A SIGHT CORRECTION VALUE OF EACH CLICK / ADJUSTMENTS ON IRONS OR OPTICS SIZE OF TARGET IN INCHES OR CENTIMETERS THE EXACT RANGE TO THE TARGET MPI OF YOUR GROUP FORMULA TO DETERMINE THE NUMBER OF MOA TO CORRECT, YOU MUST SIMPLY DIVIDE THE NUMBER OF INCHES OF ERROR OR CORRECTION BY THE VALUE OF ONE MOA AT THAT RANGE INCHES OF ERROR / TARGET RANGE, NEAREST HUNDRETH OR THE VALUE OF ONE MOA IN INCHES AT TGT RNG. = MOA CORRECTION 10 IN / 200M = 10/2 = 5 MOA 15 IN / 500M = 15/5 = 3 MOA DETERMINING CLICKS TO DETERMINE THE NUMBER OF CLICKS ON YOUR SIGHTS . YOU MUST KNOW THE VALUE OF EACH CLICK PALMA - 1/4 MOA PER CLICK OF WINDAGE AND ELEVATION. = 4 CLICKS PER MOA M3A - 1 MOA ELEVATION, 1/2 MOA ON WINDAGE M3 - 1 MOA ELEVATION AND WINDAGE M1A - 1/4 MOA ELEVATION AND WINDAGE M21 - 1 MOA ELEVATION AND 1/2 MOA WINDAGE REDFIELD PALM REAR SIGHT 1 CLICK OF WINDAGE OR ELEVATION KNOBS IS 1/4 MOA ONE COMPLETE TURN OF THE WINDAGE OR ELEVATION IS EQUAL IS 12 CLICKS OR 3 MOA THE WINDAGE KNOB HAS A TOTAL OF 36 MOA OF MOVEMENT TOTAL FOR ELEVATION IS 60 MOA ZEROING THE IRON SIGHTS ZEROING THE IRON SIGHTS SLIP THE SCALES ON THE ELEVATION AND WINDAGE SO THE SCALES READ ZERO DO NOT SLIP THE KNOB SCALES ON THE SWC WEAPONS, YOU CAN LOSE THE BALL BEARINGS INSIDE THE KNOBS AND CONSTANT SLIPPING WEARS OUT THE POST AND SCREWS READING THE IRON SIGHTS VERNIER SCALE ON IRON SIGHTS 4 MOA LEFT READING SCALE RIGHT 9 MOA MOA ? LEFT 8 MOA MOA ? RIGHT 16 MOA ELEVATION SCALE READING THE SCALE MOA ? UP 4 MOA MOA ? UP 11 MOA WINDAGE AND ELEVATION KNOBS THE KNOBS CAN ALSO BE USED TO READ THE SCALE EACH REVOLUTION EQUALS 3 MOA THE KNOBS ARE MARKED 0, 1, AND 2 THEN BACK TO ZERO THERE ARE THREE MARKS BETWEEN EACH NUMBER THE MARKS EQUAL .25 MOA ADJUSTMENT KNOBS FRONT POST SIGHT ZEROING OPTICS FIRST YOU MUST FOCUS THE RETICLE TO YOUR EYE USING THE RETICLE ADJUSTMENT ON THE OCCULAR LENS CASE. NEXT YOU ADJUST OUT PARALLEX FOR THE RANGE THAT YOU ARE ZEROING THE WEAPON. ZEROING OPTICS PROCEDURES FOR ZEROING THE OPTICS NEXT ARE THE SAME AS WITH THE IRON SIGHTS THE DIFFERENCE IS THAT THE ELEVATION KNOB “CLICKS” ARE IN 1 MOA ADJUSTMENTS, WHILE THE WINDAGE IS IN .5 MOA ADJUSTMENTS M24 RETICLE THE RETICLE HAS .75 MOA DOTS ON THE CROSS HAIRS THIS IS WHAT DISTINGUISHES THE THREE QUARTER MIL DOT RETICLE THE DOTS ARE 1 MIL FROM CENTER TO CENTER OR CROSS HAIR TO CENTER THE CROSS HAIR IS ONE FIFTH MOA NOMINAL IN THICKNESS M24 RETICLE MIL DOTS CONSIDERATIONS AFTER ZERO CHANGING THE FOCUS CAN CHANGE YOUR ZERO IF THIS HAPPENS, NOTE IT IN YOUR LOG IF POSSIBLE, OBTAIN A DIFFERENT SCOPE COLD BORE SHOT SHOOTER’S LOG EVERY SHOT IS PLACED IN THE LOG ONCE YOUR WEAPON IS ZEROED LOG IS BROKEN INTO SECTIONS GENERAL INFORMATION SHOOTING RANGES AND TARGETS COLD BORE SHOT RANGE CARD OBSERVATION LOG SNIPERS’ LOG (WEAPON ROUND COUNT) TARGETS TARGETS TARGETS TARGETS SNIPER’S RECORD
*The estimated delivery time is based on the seller's handling time, the shipping service selected, and when the seller receives cleared payment. Sellers are not responsible for shipping service transit times. Transit times may vary, particularly during peak periods.
Back to Search Results
) 
Filmsdocs
Print
Report item
and your