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The Range
Ammo & Reloading
BC of the SS109?
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<blockquote data-quote="gmar" data-source="post: 1065099" data-attributes="member: 9154"><p>First let me say <strong>THANK YOU FOR WHAT YOU DO!</strong></p><p> <img src="/images/smilies/new/patriot.gif" class="smilie" loading="lazy" alt=":patriot:" title="Patriot :patriot:" data-shortname=":patriot:" /></p><p></p><p>Not sure if this is what you're looking for but I found this on a different website:</p><p></p><p>"NATO specifications for SS109 (U.S. M855) Ball require a 61.7 grain</p><p>(q 1.5 grains) with a hardened steel penetrator at a velocity of 3,025 fps</p><p>(q 40 fps) from a 20 inch barrel 25 meters from the muzzle. Typical</p><p>velocity 15 feet from the M16A2's muzzle is around 3,100 fps. The accuracy</p><p>requirement from a test fixture equates to a maximum of approximately four</p><p>MOA over the 100 to 600 yard range. Typical accuracy of average lots in an</p><p>M16A2 is about 2+ MOA. This round must also penetrate a nominal 10 gauge</p><p>SAE 1010 or 1020 steel test plate at a range of at least 570 meters (623</p><p>yards). The M193 round will penetrate this same plate reliably at 400</p><p>yards, and about half the time at 500 yards. The 5.56mm and 7.62mm NATO</p><p>rounds will penetrate it reliably out to 700 yards or more. Nominal</p><p>ballistics for M193 and M855 Ball rounds are given in an accompanying</p><p>table. The tables were constructed from the latest data supplied by the</p><p>U.S. Army Ballistic Research Laboratory at Aberdeen Proving Ground,</p><p>Maryland.</p><p>5.56 NATO Ball Ammunition Ballistic Comparison</p><p>based on Aberdeen Proving Ground Data</p><p>velocity (fps) trajectory (in.) drop (inches) drift (inches)*</p><p>range M193 M855 M193 M855 M193 M855 M193 M855</p><p>(meters)</p><p>0 3,200 3,100 -2.5 -2.5 0.0 0.0 0.0 0.0</p><p>100 2,774 2,751 +2.8 +4.4 -2.2 -2.3 1.3 1.1</p><p>200 2,374 2,420 +2.7 +5.8 -9.9 -10.2 5.8 4.9</p><p>300 2,012 2,115 -4.9 0.0 -25.1 -25.3 14.2 11.8</p><p>400 1,680 1,833 -23.0 -15.0 -50.8 -49.5 27.6 22.4</p><p>500 1,373 1,569 -56.2 -42.9 -91.6 -86.7 47.5 38.0</p><p>600 1,106 1,323 -113.1 -88.2 -156.1 -141.3 76.4 59.5</p><p>700 995 1,106 -206.8 -156.1 -257.3 -220.9 113.5 88.4</p><p>800 927 1,010 -339.9 -267.7 -398.0 -339.2 156.1 124.9</p><p></p><p>* Drift for 10 mph wind.</p><p>M193 Ball ammunition fired in M16A1 rifle with 250 meter battle sight zero.</p><p>M855 Ball ammunition fired in M16A2 rifle with 300 meter battle sight zero.</p><p>__________________________________________________ __________________________</p><p></p><p>5.56mm Velocities and Accuracy</p><p></p><p>ammunition</p><p>55 grain Ball bullets</p><p>U.S. M193 "TW 73"</p><p>Lot TW-2-699</p><p>PMC M193</p><p>"PS 80"</p><p>Lot PS-E5-2139-79</p><p></p><p>Because the steel penetrator increases the length and changes the</p><p>weight distribution of the SS109 bullet, it is suitable for use only in</p><p>barrels with a twist of one turn in nine inches or faster. Pre-1986 Ruger</p><p>Mini-14's with the one in 10 inch twist will handle this round but</p><p>stability is marginal and accuracy falls off below zero degrees Fahrenheit.</p><p>Military rifles intended to use this ammunition have a seven inch twist to</p><p>ensure bullet stability under arctic conditions and to stabilize the even</p><p>longer L110 and M856 tracer bullets. Current production Mini-14's and some</p><p>Ranch Rifles now have seven inch twists.</p><p></p><p>To set the baseline for testing, U.S. M193 Ball was fired from both an</p><p>AR-15 (12 inch twist) and an AR-15-A2 HBAR (seven inch twist), to establish</p><p>velocity and accuracy standards. No M855 was available, as that ammunition</p><p>is restricted to U.S. government agencies.</p><p></p><p>The Hirtenberger SC ammunition tested in the AR-15-A2 came from an</p><p>initial lot supplied by Hansen Cartridge Corporation. It is suitable for</p><p>nine inch or faster twist barrels, and was included for comparison.</p><p></p><p>The IMI 223-13CL 63 grain softpoint load was included in the tests</p><p>since it is currently the only 5.56mm round with a heavy bullet readily</p><p>available. While it is usable in twelve inch twist barrels because of the</p><p>bullet's flat base and short overall length, it is sure to find favor among</p><p>owners of AR-15-A2's.</p><p></p><p>Paramilitary 5.56mm ammunition should not be fired in commercial</p><p>rifles with chambers reamed to SAAMI specifications. The SAAMI chamber used</p><p>in sporting firearms has a smaller diameter bullet seat, a shorter throat</p><p>and less free bore than military chambers. Chamber pressures can rise</p><p>dramatically when military ammunition is fired in them.</p><p></p><p>SAAMI specifications for commercial .223 ammunition specify an average</p><p>chamber pressure of 52,000 CUP. When military ammunition is fired in the</p><p>SAAMI chamber, pressures may rise to 55,000 or 60,000 CUP!</p><p></p><p>U.S. manufactured paramilitary ammunition intended for civilian</p><p>consumption is purposely loaded down to SAAMI pressure levels and bullets</p><p>are often seated deeper to accommodate the SAAMI chamber. Ammunition</p><p>certified to meet Mil-C-9963F (the military specification for M193 Ball) is</p><p>only available to U.S. government agencies and private security firms under</p><p>contract to provide security for U.S. government installations.</p><p></p><p>Imported ammunition of that type is generally loaded to standard</p><p>military levels and should be fired only in firearms with military</p><p>dimensioned chambers. To the author's knowledge, the only U.S. manufactured</p><p>commercial firearms with military chambers are the Colt AR-15 series, the</p><p>Ruger Mini-14 and Ruger No. 1 rifles manufactured since 1986.</p></blockquote><p></p>
[QUOTE="gmar, post: 1065099, member: 9154"] First let me say [B]THANK YOU FOR WHAT YOU DO![/B] :patriot: 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. [/QUOTE]
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