Mk262 Mod1 load info

[NJC]

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

[Rumbler]

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.

http://www.223reloads.com/home/223-5...uplicatingnato

[Rumbler]

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.

[Airgator0470]

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

Military Ammunition Equivalents
Cartridge	Bullet Weight (gr)	Velocity f/s	Suggested 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 IMR4064
M72 Cal .30 MATCH**	173	2640±30	47 gr IMR 4895 47.5 gr 748 47.5 gr IMR 4064
M1 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

[SB]

That's good to know. Just scored an 8 pound jug if TAC and was wondering what range to work up to.

[NJC]

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 ???

[Rumbler]

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.


Oh yeah, and they did have Varget by the pound also.

[Airgator0470]

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.


Oh yeah, and they did have Varget by the pound also.

Guys... I need AA2520 keep a look out. Do they have AA2520 by chance?

[NJC]

Bob, I will go monday and call you if I see it there..

[Rumbler]

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.