Odd place to see some 308 load data

[1$Chuck]

Was goggling around some today and stumbled upon the wikipedia page for the M24 and it was talking about match ammo. Supposedly this is the specs. Who knows but its probably worth trying out.

Match-Grade Ammunition


M24 sniper rifle, equipped with an AN/PVS-10 Sniper Night Sight (SNS).[6]

• 7.62 x 51mm M118 Match Grade A 173-grain round.
• 7.62 x 51mm M118LR Long Range A 175-grain round using Sierra MatchKing Hollow Point Boat Tail projectiles.
  • 7.62mm M118 Long Range Performance Data:
  • Muzzle velocity (nominal): 2,580 f/s (786 m/s)
  • Chamber pressure (typical): 52,000 psi (358.6 MPa)
  • Action time (max): 4 ms
  • Average horizontal spread at 1,000 meters: 10.3 in (0.984 MOA)
  • Average vertical spread at 1,000 meters: 14 in (1.337 MOA)[7]

According to JBM Ballistics,[8] using the G7 ballistic coefficient provided by Bryan Litz, the 7.62mm M118 Long Range 7.62x51mm NATO cartridge, when fired at its nominal muzzle velocity of 786 m/s (2,580 ft/s), should have approximately 878 m (960 yd) supersonic range under International Standard Atmosphere conditions at sea level (air density ρ = 1.225 kg/m3).

• 7.62 x 51mm MK 316 MOD 0 Special Ball, Long Range A 175-grain round consisting of Sierra MatchKing Hollow Point Boat Tail projectiles, Federal Cartridge Company match cartridge cases and Gold Medal Match primers and an undisclosed modified extruded propellant. The 7.62 x 51mm MK 316 MOD 0 Special Ball, Long Range cartridges have an accuracy requirement based around 10-round shotgroups. The Propellant has been verified as IMR 4064 (per NSN 1305-01-567-6944 and Federal Cartridge Company Contract/Order Number N0016408DJN28 and has a charge weight per the specs of 41.745 grains).
  • The average extreme spread radius for 10-round shotgroups shall be less than or equal to the following values:
  • 600 yd: 7.0 in (first Production Lot). This equates to a ≤ 1.1 MOA requirement at 548.6 m.
  • 300 yd: 3.5 in (after first Production Lot). This equates to a ≤ 1.1 MOA requirement at 274.3 m.

The maximum muzzle velocity standard deviation is set at 15 ft/s (4.57 m/s). Information published on acceptance tests regarding five MK 316 MOD 0 cartridge production lots indicated a sub 2.4 in at 300 yd performance. This equates to a sub 0.8 MOA performance at 274.3 m for the listed ammunition lots.[9]

 

[billybob44]

Was goggling around some today and stumbled upon the wikipedia page for the M24 and it was talking about match ammo. Supposedly this is the specs. Who knows but its probably worth trying out.

Match-Grade Ammunition


M24 sniper rifle, equipped with an AN/PVS-10 Sniper Night Sight (SNS).[6]

• 7.62 x 51mm M118 Match Grade A 173-grain round.
• 7.62 x 51mm M118LR Long Range A 175-grain round using Sierra MatchKing Hollow Point Boat Tail projectiles.
  • 7.62mm M118 Long Range Performance Data:
  • Muzzle velocity (nominal): 2,580 f/s (786 m/s)
  • Chamber pressure (typical): 52,000 psi (358.6 MPa)
  • Action time (max): 4 ms
  • Average horizontal spread at 1,000 meters: 10.3 in (0.984 MOA)
  • Average vertical spread at 1,000 meters: 14 in (1.337 MOA)[7]

According to JBM Ballistics,[8] using the G7 ballistic coefficient provided by Bryan Litz, the 7.62mm M118 Long Range 7.62x51mm NATO cartridge, when fired at its nominal muzzle velocity of 786 m/s (2,580 ft/s), should have approximately 878 m (960 yd) supersonic range under International Standard Atmosphere conditions at sea level (air density ρ = 1.225 kg/m3).

• 7.62 x 51mm MK 316 MOD 0 Special Ball, Long Range A 175-grain round consisting of Sierra MatchKing Hollow Point Boat Tail projectiles, Federal Cartridge Company match cartridge cases and Gold Medal Match primers and an undisclosed modified extruded propellant. The 7.62 x 51mm MK 316 MOD 0 Special Ball, Long Range cartridges have an accuracy requirement based around 10-round shotgroups. The Propellant has been verified as IMR 4064 (per NSN 1305-01-567-6944 and Federal Cartridge Company Contract/Order Number N0016408DJN28 and has a charge weight per the specs of 41.745 grains).
  • The average extreme spread radius for 10-round shotgroups shall be less than or equal to the following values:
  • 600 yd: 7.0 in (first Production Lot). This equates to a ≤ 1.1 MOA requirement at 548.6 m.
  • 300 yd: 3.5 in (after first Production Lot). This equates to a ≤ 1.1 MOA requirement at 274.3 m.

The maximum muzzle velocity standard deviation is set at 15 ft/s (4.57 m/s). Information published on acceptance tests regarding five MK 316 MOD 0 cartridge production lots indicated a sub 2.4 in at 300 yd performance. This equates to a sub 0.8 MOA performance at 274.3 m for the listed ammunition lots.[9]

Love to see this--I was just telling Aszeragan (Andrew) that I was going to try IMR-4064 with some Sierra 168 MK. bullets, to warm up to a new (to me) HB 700 .308.
I don't think that I will be able to get a better group with the .308 than I get with my 22-250, but I'm going to find out..Bill.

 

[j706]

Love to see this--I was just telling Aszeragan (Andrew) that I was going to try IMR-4064 with some Sierra 168 MK. bullets, to warm up to a new (to me) HB 700 .308.
I don't think that I will be able to get a better group with the .308 than I get with my 22-250, but I'm going to find out..Bill.

I love IMR-4064 in the 308 even with all its hassles of using it(crunch crunch). That load might just surprise you with its accuracy.

 

[1$Chuck]

I just bought 500 pieces of once fired M118LR brass so I'll have to cook some up.

 

[PaPa 260]

My favorite long range load for my 308 is 42.4 gr of IMR 4064 pushing the 175 Sierra MatchKing. I am using Win. match prepped brass and a Fed. 210M primer. Velocity runs 2680 fps out of a 23 1/2 Lilja 1 in 11 twist barrel. Extreme spreads run consistently under 15 fps. I have used that load for many years. I have tried Varget, RL-15, N540, N140, H4350, IMR 4350 and probably a couple of others I have forgotten about, and non of them have been as good as the IMR 4064 load. The load I listed is .4 gr under max according to the 5th edition Sierra manual. If you are using military brass, you might have to back off a little bit since it doesn't have the case capacity of the Win. brass. As always work up to. It shows no sign of pressure in my rifles. Try it you might like it.

PaPa 260

 

[Aszerigan]

The Propellant has been verified as IMR 4064 (per NSN 1305-01-567-6944 and Federal Cartridge Company Contract/Order Number N0016408DJN28 and has a charge weight per the specs of 41.745 grains). [/COLOR]

Shows where the gov't has its priorities. It can't regulate immigration, but it has time to weigh each charge down to the 1000th of a grain.

 

[kevinj110]

Shows where the gov't has its priorities. It can't regulate immigration, but it has time to weigh each charge down to the 1000th of a grain.

Ha HA something similar crossed my mind when I read that.

 

[Leo]

I would double check everything on wikki with at least one other known good source. There has been incorrect information on wikki in some other areas of study. I do not think they have any real quality control for the posting submissions.