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USMC M16A2 marksmanship/data book, PDF posted.

This is a discussion on USMC M16A2 marksmanship/data book, PDF posted. within the M16 AR15 forums, part of the Rifle Forum category; Double posted here because it took some time and effort to do this, so I hope folks will have a chance to see it. http://home.att.net/~spontius/USMC_M...book_10-91.pdf...


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Old March 22nd, 2008, 10:06 PM   #1
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USMC M16A2 marksmanship/data book, PDF posted.

Double posted here because it took some time and effort to do this, so I hope folks will have a chance to see it.

http://home.att.net/~spontius/USMC_M...book_10-91.pdf


Last edited by 2336USMC; March 22nd, 2008 at 10:52 PM.
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Old March 24th, 2008, 06:21 PM   #2
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Hi 2336USMC,

This evening, I covered the Effects of Weather on the projectile. While going back to review your data book that you have posted here, I had a question as it relates to Page 21 "Range Flag Wind Reading".

Do you happen to know what dimensions of the wind flag is used in relation to what is shown in the data book? Flags made of different material will blow differently against varying wind strengths due to size & weight of materials and will produce different angles at a particular velocity. In order for me to closely mimic using what is in the book for the Half & Full Values, what size of flag and material (nylon?) would be used so that the adjustments as shown in the chart on page 21 can be utilized for use? Any ideas or have a contact that could provide that information. Is there a standard flag used on the KD ranges in the USMC so that this informational is always applicable and true?

Thanks again,
Steven

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Old March 24th, 2008, 09:26 PM   #3
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Yes, they are standardized to some degree.

I have wondered about this myself. In the Uncle Sam's Misguided Children gun club, Uncle has control over everything, and the flags may well be identical from one base to another and over decades of time.

However, similar flag angle charts are shown in data books used for competition by all comers, and so I think there must be some standard material and weight.

But what if it is raining and the flags are wet? This is where your face, and tree branches, and a few blades of grass, and a Kestrel wind meter come in handy. I see many folks on the line with a piece of yarn tied to their spotting scope stand.

Also, on a military shooting range there are usually flags at every yard line on both sides of the range. Sometimes, say you're at the 300 yard line, you will look around and see that the flags at the 200 yard line are streaming at 4:00 to the right, but the flags at the butts are streaming at 5:00 to the left. Or worse yet, the flags on the right side of the range are streaming left, and the flags on the left side of the range are streaming right. EEK, swirling wind on the range... Some folks have been known, under these conditions, to wait on their first shot, and watch the targets come up for all the other shooters' first shot... If they can see a trend, say many other shooters' first shots came up out to the right, then they crank in another click or two left and then shoot.

Judging the wind for the first shot is one of the toughest things about long range shooting. It just takes time on the range, getting experience in varying conditions to get good at it. After the first shot you get a good idea of how far off your estimate was, and correct from there. But the wind is seldom ever constant so you need to be able to read the shifts for each shot and adjust accordingly, and of course these adjustments are dictated by the bullet weight, ballistic coefficient and muzzle velocity you are shooting. A light shifting wind that you could just ignore when shooting 175 grain .308s will have you sawing back &forth on the windage knob if you are shooting 55 grain .223s.

Once you have made your best estimate of wind, you need to convert that into clicks of sight adjustment for the rifle and ammo you are using. Remember that any correction chart shown in a military data book is specific to that rifle and ammo. For example, you may be looking at a data book for the M16A2 shooting M855 62 grain ball ammo. If you are shooting an AR15 with 80 grain Sierra Match King bullets, your windage corrections will be different.

The flag angles are only one way to get an estimate of the wind velocity.

Make no mistake, by taking an interest in accurate shooting you have been infected by a disease and there is no cure.

Oh, and by the way, none of this advice is free, for whatever it's worth. If you have ever paid a dollar in taxes, you already paid for me to spend a lot of time on the range shooting free ammo through rifles that I didn't own. Even though I'm retired I still have a duty to pass on whatever I may have learned...


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Old March 25th, 2008, 01:26 PM   #4
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2336USMC,

Thank you for all the superb information that you constantly share with myself and this community.

I have to pick your brain again about something else too in the manual.

On page 24 of the databook, it shows the target dimensions which I assume are for 200 yrds. I found some websites that carry NRA standard military targets, but they seem to be approx 1" larger in the ring areas and the black is broken into bullseye,10 and 9 respectively.

Do you know *if* it is possible to purchase official USMC military targets for use - any websites that you are aware of that carry them? Assuming that the targets have not changed size since the '91 publication - the plots and clicks labeled should still be accurate for the range I would like to start shooting at with them and map back to the databook properly.

Thanks again!
Steven

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Old March 25th, 2008, 04:16 PM   #5
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Angry

The Marine Corps uses the "5V" type targets for requal on the KD course (or used to, now there is a "combat type" course in use). Most competition matches are shot on the "10X" style targets.

The 10X targets are easy to find, the 5V targets not so much... Someone just posted this link here on the forum a few days ago:

http://www.piercetargets.com/?x=targets

these guys sell the whole targets, plastic or cardboard backed. What you really want to find is repair centers, which are just the bullseye area printed on paper so when the bullseye gets too shot up a repair center just gets pasted on. The repair centers are much easier to use on a range, just staple it to a piece of cardboard.

If you find a source for 5V paper repair centers, let me know, I'm looking for some too.

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