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Service rifle loading manual

This is a discussion on Service rifle loading manual within the Ammunition forums, part of the M14 M1A Forum category; Hi folks I have recently started collecting components to load 7.62 for my M1A. I've been reading threads from Panther308 and others regarding headspace, case ...


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Old July 12th, 2010, 09:29 PM   #1
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Service rifle loading manual

Hi folks

I have recently started collecting components to load 7.62 for my M1A. I've been reading threads from Panther308 and others regarding headspace, case length and other finer points of loading for our rifles, and have started prepping brass accordingly.

What I am looking for now is a manual for loading for the M1A. None of my manuals "designate" a 7.62 NATO round, pages and pages of .308 but no 7.62 specifically. Does any body sell a manual for the M1A only, or at least for service rifles only?

I have read about Sierra and Hornaday having a service rifle "section", but I likely would never use the rest of the data in these manuals.

Any Ideas?

Thanks,

Andy

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Old July 12th, 2010, 10:32 PM   #2
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Loading for the service rifles, military semi-autos, is a altered from bolt guns due to the differences imparted by the addition of a gas port and mechanical action.

You don't want the port pressure too high or risk damaging the mechanism. The parts that cycle and load a new round will be unduly stressed.

Most good loads can be deduced from multliple sources. In addition, get a chronograph. Takes any guesswork out of your product. You will have an ideal velocity range for a particular projectile.

I have attached the Sierra .308 Win and .223 Rem (AR-15) chapters.

Also, NJ Highpower is a great reference:
http://www.radomski.us/njhp/cart_tech.htm
Attached Files
File Type: pdf Sierra308Win.pdf (115.3 KB, 345 views)
File Type: pdf Sierra .223 Rem Manual.pdf (135.9 KB, 88 views)

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Old July 13th, 2010, 07:17 AM   #3
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I called Vihtavuori and talked to a guy at length about loading for the M14. He was very helpful.

There's also a really good essay online about reloading for the M14 - any search here ought to turn up a link. Meh... here it is:
http://www.zediker.com/downloads/m14.html

The short version is that there's a narrower range of acceptable burn rate for gas operated rifles. Also, maximum loads seem lower than for bolt guns. Finally, our rifles are designed for 175 grain or lower bullets.

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Old July 13th, 2010, 01:16 PM   #4
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The Sierra manual doesn't really have service rifle load data but the load data is a bit mild compared to some other manuals. the velocities in it are for a 26 inch barrel.

The Hornady number 7 manual has service rifle data for Hornady's Amax bullets. The data is with commercial Winchester (Hornady Frontier) cases only and they used an M1A and measured the gas port pressure. The Hornady service rifle load data seems a bit mild in commercial cases.

Speer doesn't have service rifle load data but recommends certain powders and to reduce loads by 2 grains for military cases and reduce loads by one grain for magnum primers.

Alliant Powder doesn't have service rifle data although their older data was milder than current data was closer to being usable in service rifle loads.

Accurate Arms does have service rifle load data. It hasn't been updated in a long time and the max loads seem a bit hot when using current production powders.

From the late 1980's the Hodgdon number 25 manual has the most complete service rifle load data for both military cases and commercial cases. It is only for Hodgdon powders that were available at the time and the bullets that were available then. The Hodgdon service rifle load data shows the same load data for the 168gr SMK and the M118 bullet.

The NRA published a few books that I think may still be available. They were first printed in the 1980's and have service rifle load data only for military cases. The NRA data does show a difference in loading the 168gr SMK and the M118 bullets. The loads are based on a maximum chamber pressure of 52,000 CUP.

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Old July 13th, 2010, 11:08 PM   #5
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Here's most of the published service rifle load data.

Hodgdon #25

308 / 7.62 NATO MATCH LOADS - WINCHESTER CASES

150 GRAIN BT
BL-C2 - start 47.0 2769 fps / max 49.0 2878 fps
H-335 - start 43.0 2619 fps / max 45.0 2806 fps
H4895 - start 41.0 2694 fps / max 43.0 2822 fps

168-172 GRAIN BT
BL-C2 - start 44.0 2492 fps / max 46.0 2614 fps
H-335 - start 40.0 2429 fps / max 42.0 2548 fps
H4895 - start 38.0 2403 fps / max 40.0 2525 fps

308 / 7.62 NATO MATCH LOADS - GI CASES

150 GRAIN BT
BL-C2 - start 45.0 2581 fps / max 47.0 2719 fps
H-335 - start 42.0 2589 fps / max 44.0 2728 fps
H4895 - start 40.0 2567 fps / max 42.0 2735 fps

168-172 GRAIN BT
BL-C2 - start 41.0 2360 fps / max 43.0 2565 fps
H-335 - start 38.0 2399 fps / max 40.0 2558 fps
H4895 - start 37.0 2388 fps / max 39.0 2508 fps

HORNADY #7 .308 Service Rifle Data - Winchester cases

W-748 155-gr - Start 39.5 / Max 45.2
W-748 168-gr - Start 38.0 / Max 43.1

H-4895 155-gr - Start 37.2 / Max 42.9
H-4895 168-gr - Start 34.8 / Max 41.9

IMR 4895 155-gr - Start 37.6 / Max 43.4
IMR 4895 168-gr - Start 36.0 / Max 41.4

Varget 155-gr - Start 37.6 / Max 43.2
Varget 168-gr - Start 35.5 / Max 42.7

IMR 4064 155-gr - Start 37.9 / Max 43.2
IMR 4064 168-gr - Start 36.1 / Max 41.6

RL-15 155-gr - Start 37.9 / Max 44.6
RL-15 168-gr - Start 37.5 / Max 42.0

NRA service rifle load data - LC cases

146gr FMJ - 42.0gr IMR-4895
150gr SMK - 40.5gr IMR-3031
150gr SMK - 42.0gr IMR-4895
150gr SMK - 43.0gr H4895
150gr SMK - 44.0gr IMR-4064

168gr SMK - 39.0gr IMR-3031
168gr SMK - 40.5gr IMR-4895
168gr SMK - 40.0gr H4895
168gr SMK - 41.5gr IMR-4064

174gr M118 37.5gr IMR-3031
174gr M118 39.0gr IMR-4895
174gr M118 39.0gr H4895
174gr M118 41.0gr IMR-4064

Additional NRA service rifle load data

150gr SMK - 42.0gr IMR-4320
168gr SMK - 43.0gr W-748
170gr Lapua 41.0gr IMR-4895
174gr M118 38.5gr IMR-4320
180gr SMK - 42.0gr IMR-4064

Link to Accurate Arms service rifle load data - PDF download

http://www.accuratearms.com/data/Per...page%20378.pdf

Accurate Arms service rifle load data - IMI cases

SRA 168 HPBT
A2230 - 36.0 - 40.0gr - 2557 fps
A2460 - 37.8 - 42.0gr - 2619 fps
A2495 - 38.3 - 42.5gr - 2605 fps
A2520 - 39.2 - 43.5gr - 2646 fps

MIL 175 FMJ/BT
A2230 - 36.0 - 40.0gr - 2498 fps
A2460 - 36.5 - 40.5gr - 2514 fps
A2495 - 37.4 - 41.5gr - 2540 fps
A2520 - 37.4 - 41.5gr - 2527 fps

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Old July 14th, 2010, 03:39 AM   #6
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Speer 13 uses military cases for .308 and has a few/couple loadings for service rifles in the 168 range, denoted with an asterisk. Don't know if they do the same in the last edition.

Thanks from nmbpman
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Old July 14th, 2010, 06:25 AM   #7
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Originally Posted by artkat2 View Post
Hi folks

I have read about Sierra and Hornaday having a service rifle "section", but I likely would never use the rest of the data in these manuals.

Any Ideas?

Thanks,

Andy
Soooooo.... I don't use 90% of the load data in my manuals but that doesn't keep me from buying one and using the data I need, confident in knowing it's published data from the manufacturer not a copy of an email or post that doesn't include any periphrial data. I bought the Hornady book earlier this year because it has service rifle data, I'm glad I spent the money and wrote a nice letter to Hornady thanking them for including separate SR data and encouraging them to expand on the idea.

Not to say data from other sources isn't valid or correct, but I like to cross-reference my data. I can replace a blown up M14, but not a injured or dead me (although my wife says she can... )

Support the manufacturers who support us.

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Old July 14th, 2010, 10:33 PM   #8
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Thanks guys for the Ideas, and info.

I am going to have to check my local and see if he's got the Hornaday manual. With that I should be able to cross reference with my manuals and the data above to get me to a pretty solid starting point for the bullet weights I'll be using.

While I've got the wallet open, I may buy an RCBS X die after reading about Larry Gibson's tests.

Thanks again guys,

Andy

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Old July 15th, 2010, 06:15 AM   #9
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Originally Posted by artkat2 View Post
While I've got the wallet open, I may buy an RCBS X die after reading about Larry Gibson's tests.

Thanks again guys,

Andy
Let us know how it goes with the X-die... I've been considering that and the Redding profile crimp die for the Socom, too. Anything to get away from trimming all that brass...

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Old July 16th, 2010, 10:06 PM   #10
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Quote:
Not to say data from other sources isn't valid or correct, but I like to cross-reference my data. I can replace a blown up M14, but not a injured or dead me (although my wife says she can... )
+1 on all counts

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