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Guys looking for load and component infor on the 77gr Mk 262 Mod 1 5.56 round.
I need the actual spec if it is available, a link would be cool.
Here I what I know
Projo : 77gr Sierra OTM round with cannelure
Powder : ?
Primer : CCI military ?
Brass : Black Hills or ?
Also source for components would be great. Thanks
http://www.223reloads.com/home/223-5...uplicatingnatoQuote:
NOTE: The following data exceeds SAAMI specifications and can be dangerous to use in certain rifles.
Sierra Match King 77gr BTHP
25.3gr Hodgdon Varget
LC Brass
Winchester SR Primer
Developed in a White Oak Armament 18" SPR configuration with a Wylde chamber.
Note: At the time, I was using Winchester SR primers. I would recommend Remington or CCI instead.
Any load that will give you Mk262 performance will exceed SAAMI specifications for .223. Thus, you're not going to find any published commercial data that will meet Mk262 velocities.
You shouldn't use anyone's Mk262 'recipe' straight up.
If you want to make your own Mk262 clone ammo, you NEED to get a chronograph and work up the load appropriately. Don't kid yourself thinking you can just use someone else's recipe or the commercial data and guestimate the proper load to meet a specific velocity. The Mk262 pressures/velocities are pretty hot and you're going to need to carefully find the right load for your specific rifle. And when you do find the correct load for your specific rifle, you need to reconfirm the load every time you go to a new lot # in bullets, powder, primers, or cases.
:)
Oh, one last thing NJC,
Do not ever try and duplicate a military loading in commercial brass.
Commercial brass is thinner in places that it needs to be as thick. :)
This chart indicates 24.5 grs. of TAC.
I've had great success using Re15 and AA2520.
Using LC brass, Rem Bench Rest Primers, and 23.5 grs. of AA2520, I'm hitting an average of 2765 FPS and get well under MOA, best so far for a 5-round group in my 18" WOA SPR was .575" at 100 and 1.5" at 300. Same load went .446" for 5 shots in my 20"BHW SPR.
** Your results may vary.
ALL LOADS USE MILITARY BRASS (except the 9 mm), AND
MILITARY BULLETS (OR THEIR COMMERCIAL EQUIVALENT).
REDUCE ALL LOADS BY 10% (EXCEPT THE LOAD MARK BY *) AND WORK UP
Cartridge Bullet Weight
(gr)Velocity
f/sSuggested load(s)
M41 .38 130 950±45 6.3 gr PowerPistol, 5.2 gr Unique or Universal M882 9 mm 124 1230±50 6.4 gr Accurate #5, 8 gr BlueDot M1911 .45ACP 230 820±25 5.2 Bullseye M193 5.56 mm 55 3250±40 26 gr. of H335, 26.5 gr TAC M855 5.56 mm [for 5.56 NATO chambers ONLY] 62 3020±40 26 gr of TAC MK262 5.56 mm [for 5.56 NATO chambers ONLY] 77 2750±30 24.5 gr TAC M80 7.62 mm 149 2750±20 42.5 IMR4895, 46 grs. 748 or Ball C2 M118 7.62 mm Special Ball 173 2550±30 43 grs. of RL15 or 748 M118 7.62 mm Special Ball LR (Sierra MK bullet) 175 2580±30 42.5 grs. of Varget, M852 7.62 mm MATCH (Sierra MK bullet) 168 2550±30 41.5 IMR4895 M2 Cal .30** 150-152 2740±30 49 grs. IMR4895
49 gr 748
50 gr IMR4064M72 Cal .30 MATCH** 173 2640±30 47 gr IMR 4895
47.5 gr 748
47.5 gr IMR 4064M1 Cal .30 carbine 110 1900±30 14 gr 2400 or 14 gr H-110* * Do not reduce H110 more than 3%
** Powders list are the best burning rate for use in the M1 Rifle
That's good to know. Just scored an 8 pound jug if TAC and was wondering what range to work up to.
Thanks for all the quick responses.. i appreciate it...
Anyone found a good source for the components ?? anything local, how about powder how about TAC, RE15 or Varget ???
NJC, check DSH. I was in there recently and they were well stocked. Surprisingly so.
I even found BL-(C)2 !!!!! And that stuff has been as scarce as hens teeth for months. :headbang:
Oh yeah, and they did have Varget by the pound also. :cool:
Guys... I need AA2520 keep a look out. Do they have AA2520 by chance?Quote:
Originally Posted by Rumbler
Bob, I will go monday and call you if I see it there..
I will be more than happy to check for you, Bob. I don't know off the top of my head. If they do I'll grab what I can of it for you.