.223 Rem - 77gr Sierra Match King with StaBALL 6.5 and Match Rifle 

I am extremely disappointed you aren't making videos this year. I've sat down for hours watching your videos. No one on the internet has a better reloading channel. So thank you for the videos you have for us. Still very sad. Thanks again brother!

After sighting in at 60 feet, I could easily cover 5 shots with a nickel ru-vid.comUgkxQt2uORDRfFOVSrO4idv4B90ThT6EOnEL ! Truly a pleasure to shoot! Scope was easy to adjust for eye relief. Only problem the varmints must have seen it delivered lol!Update: So impressed with shot groups at 30 yards I purchased a Hammers 3×9 with adjustable Objective scope! Now a true nail driver!

So glad this series isn't going to end. Thanks Johnny.

Yes been looking forward to more in this series

You always have THE best and informative loading videos anywhere around period... thanks for the very hard work you put into this craft!

I'm getting great results with N140 in my Colt M4. Velocity is unfortunately low due to the 16" barrel. Twist is 1in7. N540 looks promising too. Great video! Your time is appreciated!

Just took my mk12 out to 1000 yards today! 24 grs of tac, wcc brass, rem 7 1/2 primers, 2.26 oal. With suppressor I'm pushing them out at 2790 on a cold day. 45 mins of adjustment!!

Crazy man, I've been watching your old 223 videos for the past week. Now you throw up a new one. Must be a message from the reloading gods.

I’ve had the best results with H4895, of course I’m not cloning the mk262, just shooting accurately

Absolutely love this 262 series

Wow, just bought a box of the 77grs yesterday and been watching the old series the last few days and bam!! You put this out today... Thanks JRB

These are incredibly informative videos, Shawn. Still didn't keep me from buying 10 different types of powder.. LOL.I'm still doing tests myself, to see what works best in my rifle and pistol. But, after 40+ years of reloading, I have still learned a lot watching you. Thank You 🙂

WOOOOT just what I was wanting to load some heavy 223!! Thanks Johnny!

Johnny..... You are doing a bunch of awesome stuff with your channel. I enjoy all of it, but this Mk262 clone series is UNFINISHED.

I ran a test of crimping as well, sierra 77 and on hornady 55. Light/med crimp gives me average of 50fps on 77 and 70fps on 55 I used imi brass so many variables but fun. I'll do it again just to make sure it wasn't one time thing.

So, have we declared a legit “clone” yet ? Power Pro Varmint looks like a winner 👀

Wow my mouth dropped when I saw the groups for the Varmint load. Nice velocity too!

The Winchester 6.5 powder is designed for the 308 family of cartridges. It's a little to slow burning for anything smaller than that in my opinion. Great videos. Been watching for years.

Popping in here over 2 years later in hopes the next part of the series rolls out!

I’ll add one more drop to the StaBall Match bucket. Hodgon’s load data for it looks very similar to what they have for Acc 2520, which did well in this series.

Any way for you to put a top 3 or top 5 load list together? Sort of the best of the best accuracy and velocity wise. I hope this series isn't over. Its great. Thanks for the hours of loading and testing you've done.

2520 is probably made by General Dynamics in their St. Marys plant in Florida.

I would love to see a video showing how you create your targets. I like how you space out each circle. Loved the video.

I am building a MK12 clone with a Centurion Arms MK12 Barrel and have a few hundred rounds of 77gr black hills on the shelf waiting to be sent. I can't wait to determine how well it groups! I've just binge watched this series and seriously wish I had gotten heavier into reloading before COVID smacked our industry upside the head.

Find a little vibrator for those compressed loads. Makes a huge difference to create more room for bullet seating. You can buy them at Walmart below the condoms. An added plus with the Mrs too.

Great to see your .223 vids again. Keep up the great work Johnny!

Luckily for me, i recently found your channel and watched the whole series on this load. I'm starting my journey this year and this is the exact load that I would like to clone. The matches I shoot, I am limited to an 18 inch barrel, so it'd be sweet to get it up to 2800+ish. Thanks for basically being my professor of loading!

My opinion is those testing groups were going to be a little off because they weren't tailored to the barrel. They were still better than factory, which speaks to the "goodness" of the load.

Enjoyed the results! I have used bedding compound and release agent to bed the seater stem for various bullet shapes, this helps with VLD bullets and the LESS vld ogive of bullets like the 77g SMK. This is simple and easily accomplished with 5 minute JB Epoxy, and any kind of wax as a release agent.

Yep I've been around a while. Don't blow your face off! I just got in from the shooting range, and saw the bell! Nice!

Thank you for ALL the lessons brother! Just started reloading, and ran into some problems that I may not have realized if it werent for you. Saved me from blowing my freaking face off! Keep it up!

I just became a Patreon and this was the video I was hoping you would do soon!

I just bought a pound of staball 6.5 and I plan on loading up some of your mk262 loads. Can't wait to try them out.

I purchased a woa 20 inch varmint barrel in November. Realy appreciated this video. As I haven't had a chance to break it in yet. 👍👍👍

Swiss reload RS50 is awesome with these and 77tmks. 2750fps in a moderate load. Bug hole groups. N140 works almost as well. I load at 2.265 for these but have a custom chamber. 1/8 barrel really needed.

I just picked up those same calipers last week. I dig them a lot for the price. Didn’t know anyone else used them for reloading

An interesting observation: Your best group was from the StaBall pressure testers. That is quite interesting since each load had a different powder charge. One factor is certainly that you single loaded the round almost completely into the chamber before closing the bolt. That means there were none of the normal feeding stresses on the bullet. When shooting for accuracy, I always single load that way, even on my bolt guns. Feeding from a clip always seems to open up group sizes a bit.

Norma N-203, Norma, N-202, Vectan 5000, 4007SSC are all around there too.

Johnny, These cloning videos have been incredible useful to me! I have saved a lot of time and money because of you. I have watched most of your video's several times. many thanks brother. Please come back and release some videos.

Wow those shots with 6.5 staball would have all stacked up in the same spot! Interesting for sure! ✌🏼😎👍🏼

I think it's great to have you back and cranking out videos. I like the addition of your shot spotter to the mix and the new crono provide great information. The one think I like to see added is the SD to the info added at 39:05. Thanks you for your efforts it is greatly appreciated.

Glad I snagged an 8lb jug of SWMR

Much like a barrel reamer (when you chamber a barrel), we need a reamer for die seating stems so we don't deform the bullet when seating it. You'll have some bullet to bullet shape variation. But make the reamer true to spec.

Yes! Perfect timing Johnny! Reloading today

I have to admit. Sometimes I start a video I've already watched and go to bed. Just so I can support this channel.

Just when I thought I was going to bed at a good time

Years before there was a MK262 Mod1 round or a "cannelured" Sierra 77grn SMK bullet to use - I shot this load from a CR6724. Load and data below was developed by my shooting mentor and rifle builder expressly for shooting the CR6724, sub-MOA @ 1000 yards: LOAD DATA: Sierra 77grn. MatchKing (no cannelure) 24.0 grns. Accurate 2460, (Hot Load), DO NOT PUSH, start low & work up, loaded into once fired (from the CR6724) Remington Brass Remington 7.5 small rifle BR primers These are loaded mag length - 2.250" OAL + or - Come-ups for 24" Colt Accurized Rifle (6724) using load above w/ Leupold Vari-X III, 4.5x14 w/ turrets and Mil-Dots on 20MOA mount: 100- zero 200-1 1/2 min 300-3 3/4 min 350-4 min 400-5 1/2 min 450-7 1/2 min 500-9 1/4 min 550-11 1/2 min 600-12 3/4 min 700-17 3/4 min 800-23 min 900- no target 1000-35 1/2 min (34-36 depending on humidity/weather conditions) This load and rifle is still used today. (if it ain't broke don't fix it) - Come ups will also work for custom 24" Kreiger bbl'd Rem700 223 using the same load.

Really enjoyed this series. I have been doing pretty much the same thing trying to find a good load for the 77gr Sierra and you have given me lots of leads. I don't have all the powders you tested but I do about half dozen of them. Big thanks. 💯👍

Talking to High Power Service Rifle Guys, the standard starting point (200-300yrds) 77 SMK on top of 24g of Reloader15 in LC brass. 500yrds is 80g SMK on top of 24.4g of Reloader 15

In my own testing: And the best powder is "Benchmark".

I really like the shooters world match rifle.

I’m trying to learn how to reload 5.56. I want to use lighter bullets with high velocities, like 2900-3100 in a 16’ Criterion barrel. I have no equipment yet, hoping to reload my M193 used brass. Seems like CCI41’s and PP Varmint are good to look at.

...been playing catch-up with the series, what a brilliant piece of reloading research and data, great effort and much appreciated!!

I'd like to see you use that benchmark with the 77

I find that of all the powders I've used for .223 and 5.56 H335 is by far the best for speeds I'm looking for. I enjoyed that video in the series

You should get the Douglas 18" 1:7 twist MK12 barrel for proper MK262 testing.

Your channel is my favorite on you tube. I was watching this latest video and was continuing to evaluate your integration of the shot marker system. The way you are currently including the data is very good and was a lifesaver when the camera went down. Keep up the great work.

Another great video. Can't wait for you to try this powder in 6.5 Creedmoor. 👍

Your heavier XBR 24.0 load was excellent in previous video. 2769fps .636” SD 7.2 Deviation better than Varmint and match rifle.

Have you considered using the Hyskore dual dampener rifle rest? It also comes with a hydraulic trigger actuator. It is a fabulous rest for load/combination comparison/build. Removes entire human element. Returns firearm to same battery position as long as its solidly mounted to a solid bench. ( I mean hey, you got a spanky doppler chrono...., you need a spanky rest). ;-)

Not sure how I missed this one, but just looked at the data for Shooters World AR PLUS/Lovex D073-04 77 gr Sierra MK, 23.6gn, 2783 f/s

Thank you Johnny, watching the Mark 262 Mod 1 series convinced me that I should find that reloading equipment I bought and learn how to reload. Unfortunately it's a bad time to start to get into reloading, or anything firearms related. But I did manage to find some of the Sierra Match King 77gr OTM, lapua cases and an 8lb jug of Accurate 2250. But the place I got the stuff from ran out of the powder within 24 hours after I bought it. Hopefully they only sold what they had and didn't over sell it. I'll see if they ship it out. Now if I could just find primers. Those seem to be out everywhere 😢 Now I just have to find my reloading kit in the garage and see if I can't get a bench to mount it to.

You could try an adjustable carrier too to see if that will help with the over gassing. I think gemtech and bootleg both have options. Great video as always! Can't wait until I get my reloading setup going.

This was great! Watched the whole series up to this point in 1 day!

YUS! Johnny's back! Just put a Larue MBT and new Nikon 4x12 on my old 1999 era Bushmaster HBAR target--I can't wait for it to stop snowing so I can get to the range. It was 1 MOA with the stock 8 pound trigger so I'm looking forward to getting it sighted in and seeing what it can do.

Hope the new year has treated you well. Love the MK262 videos. Your guidance has been invaluable!

I enjoy watching your videos but I can't help but think the first group says everything anyone needs to know about load development. Try the same with different seating depths as well as powder charges.

I was on my way to church when I got the notification. Almost didn't go to church lol

I have 2 shooters world powders being delivered tomorrow. Totally looking fwd to getting some loads worked up.. good to see a new video..

Any chance of doing a Mk262 addendum with the new Staball Match? I’m hearing good things.

Found that 22.6grns of H4895 in my bolt gun using Berger 77grn OTM blows primers in my rifle.

Excellent series. Excellent channel. Still waiting on the final results. I thought varget would have done the trick and was amazed with the xbr 8208 results.

Can't remember if it's Nosler or Speer that lists load density with load data. Many loads specify certain powders that cannot fit into the case with max loads. The density %age really helps you pick max loads using heavy bullets that intrude into the powder space. Prevents distorted casings.

A wylde chamber for .223 is very good for what your doing , my 75 gr hornady match will print under MOA .

I love this freakin video series! I was hoping for more vids!!! Thanks

What about StaBALL Match? Little faster than 6.5, might just punch the ticket!

I hope your videos never end, they are very useful and educational!👍👍

Glad to see this series back in action. Great stuff!

I really like N133 too

TY JRB Great way 2 wind down after a busy weekend this is like ASMR 4 me I like that Match rifle my favorite powder I load up ammo for my .308 WIN., .223 REM. & .224 Valkyrie I put together a very accurate coyote load for my .224 Valkyrie 28.6gr SWMR 62gr Hornady BTHP Federal premium brass and federal AR match small rifle primer @ 3303 fps outta 24" Blackhole weaponry barrel I actually like all their powders I use Long Rifle for .224 Valkyrie 88gr ELD,..243 WIN 87gr Hornady Varmint bullets in 6mm creedmoor too up to 108gr bullets and 6.5 creedmoor 140gr bullets and like their Precision Rifle powder for .224 Valkyrie 80gr ELD, .22-250rem and .243 win for the light bullets and their Ultimate and Auto pistol powders for my Nina Ross. Keep up the good work Mr. Johnny

Another great video. I would love to see some 350 Legend videos if you ever decide to start doing load workups . Bear Creek Arsenal has a cheap 350 Legend upper. I've had some decent groups from factory ammo.

Seems to me that unknowingly screwing in the seating die down to achieve OAL may unknowingly crush your brass our start a roll crimp. I usually seat my seating dies to the brass first. all the way down to contact the brass then back off slightly. Keep up the good work NICE STUFF

Such a great series JRB, the addition of the new target system with impact velocities and on demand group sizes is fantastic. That new barrel is a great shooter. The .45” group you shot with the ladder of powder charges made me giggle watching that. I thought to my self next he could just charge the case with lee dippers and that powder and still shoot a 1/2 inch group. Really makes me ponder that FX120i scale purchase I made. Lol. Anyways heck of a job and this series and video is great.

YESSSSSSSSSSSSSSSSSSSSSSSSSSSSS THANK YOU!!!!!!!!!!!!

Let's try the H4895 again. 22.6 gr or 22.7 no crimp. Should make the velocity.

You should get a barrel from Douglas

Yes, I love this S

I am late to your channel. Great information and thanks for the time to do all this. I have had same results with BLC-2 as you had. Experimenting now with H335. Haven't seen you try H335 unless I missed it.

RE-15 got me the equivalent of Mk262.

I stuck with 77 gr SMK and Varget. It was a touch slow but groups were stupid good. If I remember, thought you had similar results with Varget.

I work for an ammo manufacture here in Illinois and we are basically the rep for Shooters World in our area. We sell it along with our ammo and we also use it an all of the ammo we make. Anyhow i recommend you give some of their other powders a try. Perhaps, Precision which is very much like Varget, Long Rifle which I enjoy, and the SW4350 is very good too.

25:00 You ever think that the AR feed ramps might be affecting the cartridge as it's going into the chamber? Can't help but wonder when it's sort of alternating between two points of impact depending on which side of the magazine the round is being picked up from. Would be really curious just as a quick fact finding mission what would happen if you hand fed 5 rounds of the same exact load.

Thank you Johnny!

Wow really looks like varmint is the way to go for these loads

Johnny are one of the best I.ve seen as to show the difference. Real good

Yes! I loved that series! Watch out for pressure in a shorter throat.

oh how i wish you would post a video tomorrow on the new StaBall Match powder with the 77gr smk... I want to know if its the ticket before i pay hazmat to get some...

I was talking to a guy about 223 loads at a store the other day while buying some varget and I mentioned your channel.. He said of course i watch JRB lol anyway we look forward to some new videos. Some 7.62x39 150ish gr loads out of a quality barreled ar15 would be awesome

Johnny, I’d like to see you try some faster powders like Benchmark and H335. I’ve had great luck with these in my 18” AR with Hornady 75gr BTHP’s. In my experience 18” and shorter barrels really like faster powders.

sounds like the recoil buffer spring is getting soft on your first lower.