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Posted: 7/19/2009 12:17:43 PM EDT
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This question came up recently amongst friends and I. What exactly is the OAL of the M118LR round? Several answers were suggested, but nothing concrete. Who has some true Mil-spec 175grn stuff lying around to provide an accurate answer. As I have been unable to get my hands on any. I'm sure they will vary by several thousandths due the meplets of the 175SMK, so a few measurements would be great. Thanks for the help.
Just found this. http://www.cheaperthandirt.com/AMM721-5.html#Reviews Looks like the real thing. Not a bad price and I'm sure I will get my answers here...I ordered a cuple of boxes. 
ETA: I got the alledged M118LR that I ordered. Heres the scoop. It's FC brass with a NATO cross, primers crimped sealed and annealed, bullets are also sealed. They appear to be genuine 175SMK, but all of the meplats are flat pretty flat (unusual). They measure 2.775 to 2.781. Inside of 5 rounds I found 38.7, 38.9, 40.1, 40.2, and 40.2 grains of a ball powder.   hmmmm....could be H335 or benchmark or maybe IMR3031 (if it's a ball powder?) I haven't shot any of them yet but I will let you guys know how they do. Whatever powder it is, it does a poor job of filling the case...maybe 75% at most. This stuff is packaged in a white Midway box and marked fereral Lake city M118 sniper ammuntion 175 SMK. I'm leary of this stuff right off the bat. What say you
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Quoted:
This question came up recently amongst friends and I. What exactly is the OAL of the M118LR round? Several answers were suggested, but nothing concrete. Who has some true Mil-spec 175grn stuff lying around to provide an accurate answer. As I have been unable to get my hands on any. I'm sure they will vary by several thousandths due the meplets of the 175SMK, so a few measurements would be great. Thanks for the help. I would feel comfortable at 2.80" COAL. |
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I'd IMAGINE that the military would load it to "magazine length"............. 2.83" (like M118 and M852) or 2.80"............"just in case" it had to be used in an M14 besides just a bolt gun.
http://www.inetres.com/gp/military/infantry/rifle/762mm_ammo.html But a few hundreths of an inch? 
Aloha, Mark |
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2.830" -0.030
straight off the drawing. http://www.everyspec.com/MISC/download.php?spec=C8597555_REV-V.015870.PDF |
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Quoted:
2.830" -0.030 straight off the drawing. http://www.everyspec.com/MISC/download.php?spec=C8597555_REV-V.015870.PDF If you read that drawing, you will find that it is not the MODERN M118 LR that uses 175gr SMK. That bullet did not exist when the drawing was made; it is dated in the 1960 and not from Lake City Arsenal, either. I have always treated 2.82 as max mag length for M14/M1A apps. And, to that end I have always capped my reloads at 2.80" to allow for any bullet variances. |
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LONG RANGE M118
lot: LC-05H272-052 SUBLOT C 2.815" 2.806" 2.808" 2.806" 2.801" Edit: Mil-spec M118LR, not XM118LR or XM118LR PD, was sold thru CMP until the supply dried up. Unopened cases of M118LR were occasionally available. M118, M852, & M80 was also available. |
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From the ATK web connection above........interesting........
The 7.62mm M118 has a plain bullet tip, does not have a bullet cannelure, and its case mouth is not crimped. The 7.62mm Special Ball cartridge is intended and specifically prepared for use in weapons designated as competition or sniper rifles.
Synonyms: 7.62 SPECIAL BALL: LR NSN: 1305014198202 I thought it was a 175 gr. BTHP bullet? http://www.sierrabullets.com/index.cfm?section=bullets&page=bullets&brandID=1&displayAll=1 Aloha, Mark |
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Quoted:
Quoted:
2.830" -0.030 straight off the drawing. http://www.everyspec.com/MISC/download.php?spec=C8597555_REV-V.015870.PDF If you read that drawing, you will find that it is not the MODERN M118 LR that uses 175gr SMK. That bullet did not exist when the drawing was made; it is dated in the 1960 and not from Lake City Arsenal, either. I have always treated 2.82 as max mag length for M14/M1A apps. And, to that end I have always capped my reloads at 2.80" to allow for any bullet variances. Look a little more closely. Rev V that I posted is was not created in 1960 (see the list of changes in the top right corner). C8597555 (REVISION V), CARTRIDGE, 7.62mm, NATO, SPECIAL BALL, M118: LONG RANGE (17 OCT 2000) uses bullet 12977194 C8597555 (REVISION M), CARTRIDGE, 7.62mm, NATO, SPECIAL BALL, M118 (07 DEC 1984) uses bullet 8595434 M118 and M118LR come from different revisions of the same drawing. |
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