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Mk262 clone

NSWEIntern

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Hi all, tried a few powders now (cfe223, blc2, and 8208xbr) for some 77g smk mk262 clone 556. Wondering if anyone has had any luck with other powders out of shorter barrels, 13.7-14.5, range. Just looking for suggestions, thanks!
 

kentuckyMarksman

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I've had great luck with VV N140 powder with 75gr and 80gr projectiles.

AA2520 has done well for me with 77gr SMK bullets. I settled on 25.2gr for my load. Johnny's Reloading Bench on Youtube did a mk262 clone video series (I didn't watch it until after I came up with 25.2gr AA2520), and funny enough, he also ended up picking the 25.2gr charge. Worth looking into.
 

W.E.G.

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MK262 is a pretty hot load.

Be sure to use a thick primer.

Better yet, use a CRIMPED thick primer.

I’m pretty sure actual 262 uses a ball powder.
 

hueyville

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To duplicate Mk 262 have had good results with three powders. All start with Lake City cases, CCI #41 primers and 77 grain SMKs with crimp cannelure. 24 grains of TAC or Varget and 25 grains of H355 have all done well based on rifle tested in. In military issue or military issue clone ammo prefer to use M855A1 EPR or Mk 318 Mod 1 of which I think the M4gery will see greatest life and durability with the Mk 318. YMMV, with an 18" 1:8 barrel or longer the Mk 262 is a fine round but I use 69 grain SMKs much more often than 77 grain for versitility.

Edit:
Above powder charges were from memory, not my notebook or label off ammo so check a manual and follow proper load building procedures. The H335 may be more like 25.1 grains. Load so many more 69s than 77s those numbers don't stick on mind as well.
 
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2barearms

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We were about to start working on these for Camp Perry……Then the outfit I was buying the powder from
screwed us on the pallet of powder……we were going to use WC 844. Which is probably what Black Hills used…
 

hueyville

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If wanting a ball powder Reloader 15 runs well with 77s and it acts like an old standard ball powder. Viht N140 and N135 will do the job based on your preference for case fill. If your using one powder for a variety of rifles might consider the Reloader 15. Are you building a load to be used in multiple NRA High Power 20" HBAR uppers or single rifle?
 

JDK15

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I’ve tried Varget and TAC with a 77smk. 24gr for both powders has gotten me good accuracy. Velocity is in the 2600 FPS range out of a 20” barrel. It is very difficult to get close to mk262 velocity with hand loads so I just load whatever shoots the best.
 

hueyville

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Learned a while back it's hard to duplicate some milspec or high performance factory loads as we don't have access to custom blended powders, ability to buy enough to ask for specific flash reducers (flash reducers also reduce flame temperature of powder) or other features. Have discovered at times when certain companies are selling huge lots of pull down projectiles and cases look to see what "cannister" powders they may be selling. The short time 5.56 M855a1 EPR 62 grain projectiles and 7.62 M80a1 projectiles along with primed Lake City cases were offered one of pull companies was selling jugs of powder optimized for 5.56 and 7.62 ammo and took a chance buying some of each. Took a chance and when it arrived had same physical appearance of powder personally examined from M855a1 pulled ammo and M80a1 ammo.

Started about 10% low and worked my way up till dropping same charge from the military issue and getting basically same velocity loading in the Lake City primed cases. Didn't get near the amount of powder to match number of cases and projectiles but got enough. Even used some of the 5.56 powder to push the 62 grain EPR projectiles from 22 Nosler getting easily 70 to 80 fps more velocity than able to get out of commercial powders before pressure signs began to show.

Duplicating velocities of specialty ammo can sometimes just be impossible if can't use the same powder that may have been optimized when made for that one task. On the flip side have been able to get higher velocities and better accuracy handloading with commom commercial powders. Just have to be careful. Main reason I have decided to keep 22 Nosler in my AR 15 lineup is to be able to push specialty 5.56 military projectiles that extra 300 fps that can be the difference in bullet performing properly at longer ranges.
 

CTW

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TAC and Accurate 2460 are my go to powders for heavy bullets in .223. I’ll admit I’ve not loaded any 77 grain smk, but my go to bullet is the Hornaday 75 grain BTHP and those 2 powders do great.
 

W.E.G.

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My go to bullet has been 69 grain SMKs but now working with the 69 grain RMRs W.E.G. speaks so highly of.

I think you'll be pleased.

Jacket thickness of the RMR is same as Sierra.

Hornady's have a thinner jacket (0.003" thinner), so you gotta keep Hornady 75 velocities down or they like to come apart due to RPM issues. We must have blew up 50 or more Hornady 75's with 24.2 grains Varget. Mostly from older barrels, but I blew up a Hornady 75 with a White Oak (Wilson) barrel that had less than 1000 rounds on it.

Frankly, I doubt you would blow up a 69 RMR with a full case of 4350 in a 220 Swift.

I run 24.2 grains TAC to push the 69 RMR. Its not a fast load. But sure is accurate. Target shooting is all I use it for.
Probably making mid-2600's velocity most days.
 

ARMOR1SGRET

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24.5 grs Tac with a mag primer is super accurate. I have taken them out to 700 in a 1/8 20 in suppressed AR. 1/2 moa is the norm. velocity is running 2725. I think mk262 runs 2750 in the same barrel. pretty hot load so work up on your own. They shoot accurately in my DD 14.5 also just slower.
 
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