This is a discussion on Black Hills MK-262 Mod 1 within the Cartridges & Calibers forums, part of the Sniping Related category; Originally Posted by Guns & Ammo Magazine When a six-man Special Operations team looking for Scuds in Iraq in early 2003 ran into a reinforced ...
Originally Posted by Guns & Ammo Magazine
Remington M-700 LTR 20" Fluted .308
Leupold MK-4 3.5-10X40mm M-1 LR
Leupold MK-4 Rings
USO Base - 0 MOA
Black Hills .308 175gr SMK
What is the BC for the blue box Black Hills HPBT 77gr?
The Mark 262 Mod 1 uses the Sierra 77 SMK Canellured, now that Sierra agreed (for the sake of the contract) to run a light canellure on the 77. Both of these are availbale for reference online, and there is zero difference in performance between the two Sierra 77s.
I will note that, having loaded to near Nato spec, attempting to duplicate the load, it is fairly impossible to do with RL-15. Using the 77SMK in NEW LC09 cases, I managed 2,675 in a standard Chromed 16" M4. Not bad, and good on pressure to 115-degree ambient temperature with a hot barrel. I wouldn't go any hotter for fear of blanking primers, and I won't run those in my match rifle either (though it'd probably be okay with the Wylde).
Like they stated, basically all 262 is is our standard highpower load on the steroid of a canister-grade powder. It IS very much more accurate, as I sometimes saw the verge of 3/4 Minute accuracy from an ACOG/M4 with over 10,000 rounds down the tube. Certainly MOA capable.
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Has anyone tried to duplicate this round using AR Comp as the powder? Alliant's data says their max load is pretty close to the Mk 262 velocities. I've worked up a load, but don't have access to a chronograph to compare it. The accuracy was fantastic (a little over .5 MOA), so I haven't tried to go up yet. I was using 21.9 grn of AR Comp with no signs of pressure. I haven't gone any higher, though I think I probably could go up a little more.
This is thread is 5 years old. Let it die, start a new post. Use google, I am sure you can find a similar recipe.
OH, google, what's that? If you're not interested, you didn't have to participate. I'm sorry; I thought this forum was here so folks could discuss things that interested them. If no one was interested, they'd ignore it completely and it will go away. It's not necessary to be an A$$!
It is also not necessary to start an argument. In a way GMinor has a point. You have to realize that in 5yrs time, many people originally in this thread are no longer present or participating in the forum... The ones that are still here, probably do not remember the conversation. I'm not saying don't be interested, we all have our interests and our questions... Ask away. But do not turn disrespectful over someone simply pointing out it's an old thread... You have been here a week... You currently have 2 posts... Not off to a good start...
- Remington 700 SPS Tactical AAC-SD (.308 WIN)
- Savage Model 11 (.270 WSM)
- Remington 760 Gamemaster (.243 WIN)
- Winchester Model 9422M (.22 Win Mag)
- Marlin Glenfield Model 20 (.22 S-L-LR)
- Marlin Glenfield Model 60 (.22 LR)
- Remington 870 Express Magnum (12 ga.)
- Winchester Ranger Model 120 (20 ga.)
- Ithaca M-66 Supersingle (.410 ga.)
- Ultra-Hi by Miroku Japan (.45 B/P)
Tech, product and ideas have also moved on. Best to start a new thread and if you want, link it to this one out of interest for the back story. Other than that, what Arkansas said.
- - - A good rifleman understands the importance of the .22LR - - -
I am working up some loads with AA 2460 and Hodgdon CFE223. I am using 77 gr Sierras and Noslers. The max for the 77s with 2460 is 2872 fps, with 75gr Hornady is 2885. The loads for CFE223 are topped out at 2811 fps with the 77 gr and 2876 fps with the 75 gr. The CFE223 loads are 223 pressure loads. If they had 5.56 level data for that powder I am sure it will easily make the speed. Waiting for my friend to drop of the chrono and will update my findings. If I get 2650-2700 fps from my 16 inch barrel I will be happy.
There are no accidents; only ignorance, mechanical failure, and acts of God! I have loaded over 6 million rounds in the last 5 years and STILL have not seen it all!