Range Report Mk 855, Mk 262 & Mk 318 BC's & velocities?
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Re: Mk 855, Mk 262 & Mk 318 BC's & velocities?
M16A2 w/ M855 = 3050fps
MK262 = is about 3000fps
M855- 0.304
Mk262 Mod1- 0.340
I don't have any numbers for Mk318
M16A2 w/ M855 = 3050fps
MK262 = is about 3000fps
M855- 0.304
Mk262 Mod1- 0.340
I don't have any numbers for Mk318
Re: Mk 855, Mk 262 & Mk 318 BC's & velocities?
LL:
I'm such an old phart I remember the '06 and 7.62x51 velocities being measured by the military at 78 feet. Do you know what instrument midpoint is used for the nominal velocities of 5.56 ammo?
And what's the velocity tolerance? The .30 calibers were +/- 30 fps, at least for the Match stuff.
Don't know the standards for "overhead fire mission" ammo, but it was supposed to be selected for velocity uniformity, as little chance of a slow round as possible, for use in that old program of machine guns shooting over the troops' heads while they crawled under barbed wire during basic training. I hear they don't do that any more though.
LL:
I'm such an old phart I remember the '06 and 7.62x51 velocities being measured by the military at 78 feet. Do you know what instrument midpoint is used for the nominal velocities of 5.56 ammo?
And what's the velocity tolerance? The .30 calibers were +/- 30 fps, at least for the Match stuff.
Don't know the standards for "overhead fire mission" ammo, but it was supposed to be selected for velocity uniformity, as little chance of a slow round as possible, for use in that old program of machine guns shooting over the troops' heads while they crawled under barbed wire during basic training. I hear they don't do that any more though.
Re: Mk 855, Mk 262 & Mk 318 BC's & velocities?
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Lowlight</div><div class="ubbcode-body">M16A2 w/ M855 = 3050fps
MK262 = is about 3000fps
M855- 0.304
Mk262 Mod1- 0.340
I don't have any numbers for Mk318 </div></div>
3,000 fps seems awfully fast for a 77 grain bullet from a 5.56 case. Most of the Service Rifle shooters seem to be getting between 2700 & 2800...
Do you have any idea who is making the bullet they are putting in the Mk318?
Cheers,
DC
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Lowlight</div><div class="ubbcode-body">M16A2 w/ M855 = 3050fps
MK262 = is about 3000fps
M855- 0.304
Mk262 Mod1- 0.340
I don't have any numbers for Mk318 </div></div>
3,000 fps seems awfully fast for a 77 grain bullet from a 5.56 case. Most of the Service Rifle shooters seem to be getting between 2700 & 2800...
Do you have any idea who is making the bullet they are putting in the Mk318?
Cheers,
DC
Re: Mk 855, Mk 262 & Mk 318 BC's & velocities?
DC, the listed MV on the Mk12 w/ the Mk262 is 3050fps, so the round is moving pretty good. I know I shoot a lot of it and it is really a good round, where exact MV falls I am not sure, but that numbers is basically what most are using. I'm not anal enough with the 5.56 to sweat it.
The Mk318 is a Federal 62gr bullet.
I havent' seen it yet, so I can't tell you, majority of the 5.56 we see is the Mk262
DC, the listed MV on the Mk12 w/ the Mk262 is 3050fps, so the round is moving pretty good. I know I shoot a lot of it and it is really a good round, where exact MV falls I am not sure, but that numbers is basically what most are using. I'm not anal enough with the 5.56 to sweat it.
The Mk318 is a Federal 62gr bullet.
I havent' seen it yet, so I can't tell you, majority of the 5.56 we see is the Mk262
Re: Mk 855, Mk 262 & Mk 318 BC's & velocities?
Here is some raw data from my service rifle (most values from a 20 inch Krieger, 1/7.7 twist OR 20 inch Douglas 1/7 "D"). These are 5 shot strings, and in the sequence of extreme spread-average-standard deviation. Black Hills made two types of the type classifed M262. Mod 0 is a 77 SMK WITHOUT cannelure, and Mod 1 is a 77 SMK WITH cannelure. Testing temperatures were 75-80 degrees. My Oehler was 10 feet from the muzzle, so add 8-10 fps for a true "muzzle velocity."
Mod 0: 23-2801-9; 46-2818-16
Mod 1: 20-2800-8; 22-2790-8
Navy 77 Black Hills: 23-2681-10; 105-2582-?; D:64-2634-26; D:11-2624-4
M855: 30-3142-10; 30-3192-11; D:50-3092-18; D:49-3113-24
Fed GMM 69: 54-2868-20; 32-2916-12; D:49-2737-24; D:97-2755-41
Here is some raw data from my service rifle (most values from a 20 inch Krieger, 1/7.7 twist OR 20 inch Douglas 1/7 "D"). These are 5 shot strings, and in the sequence of extreme spread-average-standard deviation. Black Hills made two types of the type classifed M262. Mod 0 is a 77 SMK WITHOUT cannelure, and Mod 1 is a 77 SMK WITH cannelure. Testing temperatures were 75-80 degrees. My Oehler was 10 feet from the muzzle, so add 8-10 fps for a true "muzzle velocity."
Mod 0: 23-2801-9; 46-2818-16
Mod 1: 20-2800-8; 22-2790-8
Navy 77 Black Hills: 23-2681-10; 105-2582-?; D:64-2634-26; D:11-2624-4
M855: 30-3142-10; 30-3192-11; D:50-3092-18; D:49-3113-24
Fed GMM 69: 54-2868-20; 32-2916-12; D:49-2737-24; D:97-2755-41
Re: Mk 855, Mk 262 & Mk 318 BC's & velocities?
The numbers for Mod 0 & 1 are about what I can get with a pretty full case of Varget & the 77 grain SMK. I hadn't realized Black Hills did a run for the Navy. I see on the Black Hills web site they are advertising 2750 for their 75 grain heavy match and 77 SMK loads.
Cheers,
DC
The numbers for Mod 0 & 1 are about what I can get with a pretty full case of Varget & the 77 grain SMK. I hadn't realized Black Hills did a run for the Navy. I see on the Black Hills web site they are advertising 2750 for their 75 grain heavy match and 77 SMK loads.
Cheers,
DC
Re: Mk 855, Mk 262 & Mk 318 BC's & velocities?
Navy MK262mod0 showed a consistent 2900 out of my WOA service rifle. Yes, very good stuff but the latest greatest stuff now is by Atlanta Arms. The AMU and NG teams have it and it shows 3000fps out of a service rifle. Very low temp sens., ball powder and 77SMK that have the same elevation as an 80gr. at 600 yards.
Navy MK262mod0 showed a consistent 2900 out of my WOA service rifle. Yes, very good stuff but the latest greatest stuff now is by Atlanta Arms. The AMU and NG teams have it and it shows 3000fps out of a service rifle. Very low temp sens., ball powder and 77SMK that have the same elevation as an 80gr. at 600 yards.
Re: Mk 855, Mk 262 & Mk 318 BC's & velocities?
The All Guard guys were shooting both Atlanta Arms and BH Mk 262 ammo this past weekend in our state championship match. They hate the BH stuff, say it uses a Chinese powder that stinks and is dirty producing poor accuracy. The Atlanta Arms stuff they shot was way better.
LL much have a special sauce batch if it is going 3050.
The All Guard guys were shooting both Atlanta Arms and BH Mk 262 ammo this past weekend in our state championship match. They hate the BH stuff, say it uses a Chinese powder that stinks and is dirty producing poor accuracy. The Atlanta Arms stuff they shot was way better.
LL much have a special sauce batch if it is going 3050.
I say this is bull , they must have out shot you!
Black Hills have the contract with the government for MK 262 ammo
I believe they use TAC powder
Maybe a Magnum primer CCI 400 will get you the Vel u are looking for
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Op,
Just as Longebow stated above, Black Hills made MK 262 in MOD 0 with a non-cannelured 77gr. SMK & MOD 1 with a cannelured 77gr. SMK. Can't help you much on MV out of a 20" though. My eyes & ears are getting pretty old so mostly shoot scoped/suppressed 18" or shorter rifles. The BH MK 262 MOD 1 makes 2825FPS (5 shot average approx. 80F) out of the 18" Krieger 1x7.7 I use with groups easily sub-MOA out to 750yds. in good conditions. The accuracy spec on the MK318 cartridge is not very demanding (2 MOA IIRC). MK318 grouped about 1.5"@100yds out of the 18" Krieger with MV 2937FPS & 2498FPS from 10" Colt 1x7 (approx. 80F). And the MK318 bullet fragmented quite nicely out of the 10" on test shots into water where as M193 will not frag out of 10" (MV 2638FPS). I just don't shoot much M855 at all. HTH
(L-R): MK318 SOST/LC M193/SWA 70gr. TSX fired from 10" Colt into water:
Just as Longebow stated above, Black Hills made MK 262 in MOD 0 with a non-cannelured 77gr. SMK & MOD 1 with a cannelured 77gr. SMK. Can't help you much on MV out of a 20" though. My eyes & ears are getting pretty old so mostly shoot scoped/suppressed 18" or shorter rifles. The BH MK 262 MOD 1 makes 2825FPS (5 shot average approx. 80F) out of the 18" Krieger 1x7.7 I use with groups easily sub-MOA out to 750yds. in good conditions. The accuracy spec on the MK318 cartridge is not very demanding (2 MOA IIRC). MK318 grouped about 1.5"@100yds out of the 18" Krieger with MV 2937FPS & 2498FPS from 10" Colt 1x7 (approx. 80F). And the MK318 bullet fragmented quite nicely out of the 10" on test shots into water where as M193 will not frag out of 10" (MV 2638FPS). I just don't shoot much M855 at all. HTH
(L-R): MK318 SOST/LC M193/SWA 70gr. TSX fired from 10" Colt into water:
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