So im sitting here in my chew in Iraq playin with my sierra infinity ballistics program (which I highly recommend BTW) trying to find out where this round is at at different ranges. Google isnt proving much help, anyone have any info?
First let me say THANK YOU FOR WHAT YOU DO!
Not sure if this is what you're looking for but I found this on a different website:
"NATO specifications for SS109 (U.S. M855) Ball require a 61.7 grain
(q 1.5 grains) with a hardened steel penetrator at a velocity of 3,025 fps
(q 40 fps) from a 20 inch barrel 25 meters from the muzzle. Typical
velocity 15 feet from the M16A2's muzzle is around 3,100 fps. The accuracy
requirement from a test fixture equates to a maximum of approximately four
MOA over the 100 to 600 yard range. Typical accuracy of average lots in an
M16A2 is about 2+ MOA. This round must also penetrate a nominal 10 gauge
SAE 1010 or 1020 steel test plate at a range of at least 570 meters (623
yards). The M193 round will penetrate this same plate reliably at 400
yards, and about half the time at 500 yards. The 5.56mm and 7.62mm NATO
rounds will penetrate it reliably out to 700 yards or more. Nominal
ballistics for M193 and M855 Ball rounds are given in an accompanying
table. The tables were constructed from the latest data supplied by the
U.S. Army Ballistic Research Laboratory at Aberdeen Proving Ground,
Maryland.
5.56 NATO Ball Ammunition Ballistic Comparison
based on Aberdeen Proving Ground Data
velocity (fps) trajectory (in.) drop (inches) drift (inches)*
range M193 M855 M193 M855 M193 M855 M193 M855
(meters)
0 3,200 3,100 -2.5 -2.5 0.0 0.0 0.0 0.0
100 2,774 2,751 +2.8 +4.4 -2.2 -2.3 1.3 1.1
200 2,374 2,420 +2.7 +5.8 -9.9 -10.2 5.8 4.9
300 2,012 2,115 -4.9 0.0 -25.1 -25.3 14.2 11.8
400 1,680 1,833 -23.0 -15.0 -50.8 -49.5 27.6 22.4
500 1,373 1,569 -56.2 -42.9 -91.6 -86.7 47.5 38.0
600 1,106 1,323 -113.1 -88.2 -156.1 -141.3 76.4 59.5
700 995 1,106 -206.8 -156.1 -257.3 -220.9 113.5 88.4
800 927 1,010 -339.9 -267.7 -398.0 -339.2 156.1 124.9
* Drift for 10 mph wind.
M193 Ball ammunition fired in M16A1 rifle with 250 meter battle sight zero.
M855 Ball ammunition fired in M16A2 rifle with 300 meter battle sight zero.
__________________________________________________ __________________________
5.56mm Velocities and Accuracy
ammunition
55 grain Ball bullets
U.S. M193 "TW 73"
Lot TW-2-699
PMC M193
"PS 80"
Lot PS-E5-2139-79
Because the steel penetrator increases the length and changes the
weight distribution of the SS109 bullet, it is suitable for use only in
barrels with a twist of one turn in nine inches or faster. Pre-1986 Ruger
Mini-14's with the one in 10 inch twist will handle this round but
stability is marginal and accuracy falls off below zero degrees Fahrenheit.
Military rifles intended to use this ammunition have a seven inch twist to
ensure bullet stability under arctic conditions and to stabilize the even
longer L110 and M856 tracer bullets. Current production Mini-14's and some
Ranch Rifles now have seven inch twists.
To set the baseline for testing, U.S. M193 Ball was fired from both an
AR-15 (12 inch twist) and an AR-15-A2 HBAR (seven inch twist), to establish
velocity and accuracy standards. No M855 was available, as that ammunition
is restricted to U.S. government agencies.
The Hirtenberger SC ammunition tested in the AR-15-A2 came from an
initial lot supplied by Hansen Cartridge Corporation. It is suitable for
nine inch or faster twist barrels, and was included for comparison.
The IMI 223-13CL 63 grain softpoint load was included in the tests
since it is currently the only 5.56mm round with a heavy bullet readily
available. While it is usable in twelve inch twist barrels because of the
bullet's flat base and short overall length, it is sure to find favor among
owners of AR-15-A2's.
Paramilitary 5.56mm ammunition should not be fired in commercial
rifles with chambers reamed to SAAMI specifications. The SAAMI chamber used
in sporting firearms has a smaller diameter bullet seat, a shorter throat
and less free bore than military chambers. Chamber pressures can rise
dramatically when military ammunition is fired in them.
SAAMI specifications for commercial .223 ammunition specify an average
chamber pressure of 52,000 CUP. When military ammunition is fired in the
SAAMI chamber, pressures may rise to 55,000 or 60,000 CUP!
U.S. manufactured paramilitary ammunition intended for civilian
consumption is purposely loaded down to SAAMI pressure levels and bullets
are often seated deeper to accommodate the SAAMI chamber. Ammunition
certified to meet Mil-C-9963F (the military specification for M193 Ball) is
only available to U.S. government agencies and private security firms under
contract to provide security for U.S. government installations.
Imported ammunition of that type is generally loaded to standard
military levels and should be fired only in firearms with military
dimensioned chambers. To the author's knowledge, the only U.S. manufactured
commercial firearms with military chambers are the Colt AR-15 series, the
Ruger Mini-14 and Ruger No. 1 rifles manufactured since 1986.
Not sure if this is what you're looking for but I found this on a different website:
"NATO specifications for SS109 (U.S. M855) Ball require a 61.7 grain
(q 1.5 grains) with a hardened steel penetrator at a velocity of 3,025 fps
(q 40 fps) from a 20 inch barrel 25 meters from the muzzle. Typical
velocity 15 feet from the M16A2's muzzle is around 3,100 fps. The accuracy
requirement from a test fixture equates to a maximum of approximately four
MOA over the 100 to 600 yard range. Typical accuracy of average lots in an
M16A2 is about 2+ MOA. This round must also penetrate a nominal 10 gauge
SAE 1010 or 1020 steel test plate at a range of at least 570 meters (623
yards). The M193 round will penetrate this same plate reliably at 400
yards, and about half the time at 500 yards. The 5.56mm and 7.62mm NATO
rounds will penetrate it reliably out to 700 yards or more. Nominal
ballistics for M193 and M855 Ball rounds are given in an accompanying
table. The tables were constructed from the latest data supplied by the
U.S. Army Ballistic Research Laboratory at Aberdeen Proving Ground,
Maryland.
5.56 NATO Ball Ammunition Ballistic Comparison
based on Aberdeen Proving Ground Data
velocity (fps) trajectory (in.) drop (inches) drift (inches)*
range M193 M855 M193 M855 M193 M855 M193 M855
(meters)
0 3,200 3,100 -2.5 -2.5 0.0 0.0 0.0 0.0
100 2,774 2,751 +2.8 +4.4 -2.2 -2.3 1.3 1.1
200 2,374 2,420 +2.7 +5.8 -9.9 -10.2 5.8 4.9
300 2,012 2,115 -4.9 0.0 -25.1 -25.3 14.2 11.8
400 1,680 1,833 -23.0 -15.0 -50.8 -49.5 27.6 22.4
500 1,373 1,569 -56.2 -42.9 -91.6 -86.7 47.5 38.0
600 1,106 1,323 -113.1 -88.2 -156.1 -141.3 76.4 59.5
700 995 1,106 -206.8 -156.1 -257.3 -220.9 113.5 88.4
800 927 1,010 -339.9 -267.7 -398.0 -339.2 156.1 124.9
* Drift for 10 mph wind.
M193 Ball ammunition fired in M16A1 rifle with 250 meter battle sight zero.
M855 Ball ammunition fired in M16A2 rifle with 300 meter battle sight zero.
__________________________________________________ __________________________
5.56mm Velocities and Accuracy
ammunition
55 grain Ball bullets
U.S. M193 "TW 73"
Lot TW-2-699
PMC M193
"PS 80"
Lot PS-E5-2139-79
Because the steel penetrator increases the length and changes the
weight distribution of the SS109 bullet, it is suitable for use only in
barrels with a twist of one turn in nine inches or faster. Pre-1986 Ruger
Mini-14's with the one in 10 inch twist will handle this round but
stability is marginal and accuracy falls off below zero degrees Fahrenheit.
Military rifles intended to use this ammunition have a seven inch twist to
ensure bullet stability under arctic conditions and to stabilize the even
longer L110 and M856 tracer bullets. Current production Mini-14's and some
Ranch Rifles now have seven inch twists.
To set the baseline for testing, U.S. M193 Ball was fired from both an
AR-15 (12 inch twist) and an AR-15-A2 HBAR (seven inch twist), to establish
velocity and accuracy standards. No M855 was available, as that ammunition
is restricted to U.S. government agencies.
The Hirtenberger SC ammunition tested in the AR-15-A2 came from an
initial lot supplied by Hansen Cartridge Corporation. It is suitable for
nine inch or faster twist barrels, and was included for comparison.
The IMI 223-13CL 63 grain softpoint load was included in the tests
since it is currently the only 5.56mm round with a heavy bullet readily
available. While it is usable in twelve inch twist barrels because of the
bullet's flat base and short overall length, it is sure to find favor among
owners of AR-15-A2's.
Paramilitary 5.56mm ammunition should not be fired in commercial
rifles with chambers reamed to SAAMI specifications. The SAAMI chamber used
in sporting firearms has a smaller diameter bullet seat, a shorter throat
and less free bore than military chambers. Chamber pressures can rise
dramatically when military ammunition is fired in them.
SAAMI specifications for commercial .223 ammunition specify an average
chamber pressure of 52,000 CUP. When military ammunition is fired in the
SAAMI chamber, pressures may rise to 55,000 or 60,000 CUP!
U.S. manufactured paramilitary ammunition intended for civilian
consumption is purposely loaded down to SAAMI pressure levels and bullets
are often seated deeper to accommodate the SAAMI chamber. Ammunition
certified to meet Mil-C-9963F (the military specification for M193 Ball) is
only available to U.S. government agencies and private security firms under
contract to provide security for U.S. government installations.
Imported ammunition of that type is generally loaded to standard
military levels and should be fired only in firearms with military
dimensioned chambers. To the author's knowledge, the only U.S. manufactured
commercial firearms with military chambers are the Colt AR-15 series, the
Ruger Mini-14 and Ruger No. 1 rifles manufactured since 1986.
Hmm that is some interesting info. Thanks.
No one knows the BC of this bullet? I must say Im surprised.
Maybe this ... and, thanks for your service!
From AR-15 Ammo Oracle article:
Quote:
"The M855 cartridge is based on the FN-designed SS-109 bullet, and has a gilding metal-jacketed, lead alloy core bullet with a steel penetrator. The primer and case are waterproof. It was adopted by NATO in 1980 as the standard small arms ammunition for NATO forces. Its ballistic coefficient is typically 304."
Not my info... but I hope it helps...
From AR-15 Ammo Oracle article:
Quote:
"The M855 cartridge is based on the FN-designed SS-109 bullet, and has a gilding metal-jacketed, lead alloy core bullet with a steel penetrator. The primer and case are waterproof. It was adopted by NATO in 1980 as the standard small arms ammunition for NATO forces. Its ballistic coefficient is typically 304."
Not my info... but I hope it helps...
Ive seen that number one other place, and its the first number ive seen more than once, so Ill roll with it i guess lol.
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