I usually can't watch vidoes longer than 30 minutes, but your video's have always been the exception. Nice work, looking forward to the next tests.

I have the 16" AR Stoner barrel as well but with the pistol gas length and it is a good shooter. My favorite hand loads as of now is 17.8gr w296, Hornady brass, CCI 400, Hornady 125sst. I've taken it to 300yds with very consistent hits on my 12x8 steel. All with a Dead Air Sandman Ti suppressor. Your channel is my go to for 300blk. Thank you.

Wow! I just Independently did some very similar testing of CFE-BLK and Shooters World Blackout, with very similar results. I started just under recommended start load for supers and worked backwards in .5 grain increments. With my suppressed 11.5" barrel I reached subsonic at 12.5 grains of CFE-BLK and functioned the action perfectly all the way down to 10.5 where I stopped. Accuracy was much better for me though. I was using 168 grain HPBT I purchased in (blem) bulk from Midsouth Shooters.

I did a similar workup for both these bullets with great results, however neither of these bullets will expand under 1600fps making them useless for anything other than plinking for subsonic use. They over penatrate , ricochet terribly and they are very expensive for plinking use. Don't waste your time or money with either of these bullets for subs. I suggest Berry's Plated Bullets for plinking/practice and Hornadys Sub-x line of bullets for everything else.

Thanks for getting right on this powder. I love CFE223 for how nicely it will meter in a progressive friendly measure. When I heard that they were offering a powder tailored for 300BO, I knew I would at least be giving it a try.

Thanks, great data. I'll have to order some CFE BLK.

Thank you sir your videos have made me really want to get stared reloading just found some of this powder for a decent price I'm going to pick is up and a press kit asap.

the reason why it doesn't cycle right is due to the carbine gas length the 300blackout is optimized to shoot in a short barrel with pistol gas lengths. swap out the barrel for a 16 inch with pistol gas n a adjustable gas block n it will work either sub or super. That is just what I have learned personally

Awesome poweder from them. Had in their magazine with a full work up. Also they came out with stayball 6.5 also

Truly outstanding work and presentation thereof - thank you!

Great video sir. Doing the primer video now makes a lot of sense. I would like to see you throw some 150ish grain bullets in the mix like you mentioned. Thanks for saving me time and money.

Holy crap.... I'm gonna get some of that pow pow powder :) ..... Dude I love this channel. Why the hell don't you have more subscribers????

Thank you for sharing all the great info! Outstanding video!

you have totally talked me into hand loading

Older vid, but I think one thing you'll find is that CFEBLK really only produces low velocity spreads when it's in a compressed load. Uncompressed loads tend to have broad velocity spreads. That's unfortunate as it's a great powder for subsonic 300Blackout as far as gas and quietness is concerned. AA 1680 is also a very good 300 BLK subsonic powder, but it tends to be louder.

Hi Johnny I really enjoyed watching your videos very informative. Keep up the good work. I enjoy shooting 300BLK out my self. Take care brother.

I wonder if your ES and SD would be much lower if you hadn't loaded so long (2.260"). I get trying to keep the bullet closer to the lands, but some powders don't do well with a lot of air space in the case. For instance, AA1680 data for the 220gr SMK is loaded to 2.089" and is a compressed charge. They must have chosen a short COAL for a reason. Hmmmm.... Excellent series so far.

Great video as usual. Thank you for your time.

The 1st couple shots that had the out of round holes were also like 800fps. The slower the fps the faster it needs to spin. Keep it up!

Magpul is coming out with a 300 Blackout PMAG supposed to fix all the common problems with the longer sub load bullets

i set my length similar to you but i have a case for each caliber i reload that i cut the neck with a cut off wheel, hotdog style.i use this case to set my oal in the press and to measure my lands in my rifles. works good to get you close.

Awesome video! I'll be starting some subsonic loads when I get closer to getting my AAC SD. I still need to get a Chrono. I only have H110 to use right now, but I will probably get some CFE BLK to try as well and compare them out of my 7.5" barrel if I dont wind up changing it out to 10.5" by them. I should also note mine is on a pistol lower and doesn't cycle very well since I dont have a stock to help keep it from "limp wristing". When braced properly it functions nicely though. I just want to make a 10.5" mini dissipator. Hahaha.

yeah I think a hotter primary ignition would benefit you on these loads for a more consistent ignition.

I'm pretty new to reloading, and so far only reload for my 308. I write the powders and charge weights on each case for the work up. Best SD was 8.8. Since you didn't say how you keep track of what your charge weights are, I thought I'd mention it. My can is in NFA purgartory, but I should see it about the same time as SIG finally starts shipping the short barrel for the MCX in 300 BLK. I'm looking forward to see how the rest of this series goes!

Johnny- I really enjoy your videos. It would be really helpful if you listed the remaining variables on your targets....primers and brass. Many thanks.

Great video. Thx for the info man. You sound like champ from anchorman.

Freaking KZfaq is screwing with you. My previously like videos don't show the thumbs up any more. Just liked this one for the 5th time.

I have a lot of 190 grain Sierra MKs from years ago when they were supposed to be good for the 600 yd. stage for across the. Course competition.

I finally got some of this powder but haven't loaded anything with it yet. My 7.5 inch upper from bear creek does not like to cycle much of anything other than supers. I want to run subs through it but finding subs that cycle it difficult. At first it wouldn't extract. I switched to an ultra light bolt carrier and buffer, and reduced power spring, and now it will extract and eject but won't load the next round. The bolt gets stopped trying to strip the next round out of the mag. I switched to Lancer mags that are made for 300blk rounds, and the stoppages have reduced but aren't gone. I'm thinking of having the gas port bored out, even if I have to switch to an extra power spring, but that will cost so much that it will probably be cheaper to buy a new barrel.

Great video. However, I am having trouble with using the magneto chronograph and accuracy checking at the same time. Since the magneto was hanging off the barrel, it changes the barrels vibration notes along with a couple of other factors. I have often chronographed and check for accuracy at the same time, but have used an older or a crony. Have you checked accuracy with and without the magneto on the barrel of various firearms? Keep them coming and all the best.

@Johnny's Reloading Bench Do you use an adjustable Gas Block? Doesn't sound like it.

Can you do a video on 45 acp powder choices, similar to the one on 9 mm powder selection? i would greatly appreciate it

My question would be. How much will the performance change with a suppressor

I would like to see you test this powder with the Palmetto Projectiles cast bullet. We changed over to the 1680 after seeing your series on using it for the PP cast and it has worked out great for our pistol. Thanks for the great work you are doing.

I've done some testing myself on a 8.5" suppressed system with 220 gr Sierra Match King HPBT. I know you were showing better accuracy with 12+ gr loads but I found as I reduce to 10.5 I was getting much tighter groups. My rounds are seated a little deeper I think at 2.181" COAL but not sure if this would have an effect with greater pressure. I'm really just looking for a reliable subsonic round to use in my suppressed rig so any ideas would be appreciated.

Do you know what would be best powder charge and COL for my 300BO 9.5" barrel Suppressed using Accurate 1680 Powder with the Hornady 208gr ELD to keep it subsonic? Thanks

Very nicely explained

Is there any worthy cross over of bullet/powder that is 'good' in both 308 and 300blk if I wanted to buy one kind in bulk? Talking like sub 600 yard shooting. Like have you experimented with SMK 168 in both cases?

Nice video johnny what are the scopes vortex viper PST ?and which do you prefer between the two the one on the sbr or 16" rifle

great videos brother!

I noticed on the Sierra Match King 220gr for the CFE BLK you used a OAL of 2.260" but on the posters you showed for the AA1680 it showed an OAL of only 2.20" so wouldn't that mess up the testing differences between the CFE BLK and AA1680 for the 220gr Sierra Match King data?

When you shot this video did you turn the necks of the brass with a neck turning tool to acquire the same neck tension from shot to shot? This could account for some of the velocity charting erratic velocities.

Outstanding content. Have you done any comparison between CFEBLK and any other powder for the Hornady 220gr ELD-X? Always looking for new sub recipes and have a major stockpile of the 220gr from other rifles. I currently run 3 300 Blackouts 7 inch SBR with pistol gas 7.5 inch with pistol gas 16 inch with pistol gas Though all are configured to accept my AAC 7.62SDN-6 can, I predominantly just run the subs through the pistols and leave the supers for the rifle.

Question: what model Magneto speed do you have? How did ya get it adjusted correctly around the handguard.?

primer test should have been first brother. them SD numbers will probably be helped with magnums

gempro scale ... I like mine but have to say it does not accept trickling well ... I have to lift and replace the pan constantly. have you ever thought it may be the culprit when you get those higher charge less velocity situations? just a thought

the Hodgdon website shows 220 smk with cfe BLK at 12.1gr max. Whats the idea behind going way down to 10 gr and then past the "Never Exceed"? Am I missing something

How would you compare the grain size of CFE BLK to Win296? Do you deburr the flash holes of your casings? Do you think a 1/7 twist would give you appreciably better results?

How do you know when its too slow? I started with 11 grains and got 850fps? My 11 grains was the best grouping.. I tested 11.2, 11.4, 11.6. I stopped there and velocity was 950ish.

My question is how much would your data change shooting out of the 8.5 inch gun without the suppressor

Having major issues with a dirty chamber! Please help! 8" pistol length AR. Using 12.6gr CFEBLK, 220 sierra MK, I can only shoot 120 or so rounds then the chamber is so dirty the next case will not chamber 100% and is stuck in the chamber so bad I have to tap it out (tapping charging handle). I can run a bore snake through it a few times and it's good to go for a few mags. The case is not expanding enough to seal the chamber. Is CFEBLK just not going to work? I would love to stay subsonic bit blkout sure if this powder is going to work. Any thoughts? Thanks!

What was overall cartridge length?

Is there a good source of data for CFE BLK? Not sure if there is a lot published with this powder being relatively new.

I see you turning your trickler counter-clock wise. To us it have left hand threads?

Damn, I've been waiting on this powder to become available. I've been watching your channel for a while now and I can't help but ask why haven't you gotten a 1in 7 twist barrel yet?

What primer did you use in the 300 blackout, 208 eld and cfe 223 test?

I want to load a good plinking round for my 300 blackout. What do you recommend for the supersonic range?

Will this be able to expand and be a decent hunting round. Would love to see terminal ballistics ie a hell block on your final loads set up at the target range. Not to many videos out there are able to accurately hit/and show terminal performance. Would add some depth to the conversation and bullet choice

@8:48 even if the projectile wasn't stabilized, 15 ft target seems too close to notice keyholing . Shouldn't you look for that out at 50-100 yards ? And @17:36 that odd ball shot is what we call an "outlier". In medical research, and statistics for all fields, an "outlier" can in many cases can be legitimately be removed if you understand why it happened, where it came from and it's rare. Not trying to armchair quarterback ...just curious about the key holing. Just starting out... your vids are much appreciated. I have Unique, TB, 4227 and 1680 . Thank you !

have you ever dealt with lovex powder 063-02? shooters world sells it as blackout. a guy local to me was getting it during the 1680 drought. he told me to use 1680 load data as a starting point.

Why would you ever run the subsonic without the suppressor?

Good video Johnny. How do you establish the diagonal line on your velocity charts? Thanks.

johnny what brand caliper you're using?

you said about needing stuff to watch. well I have a channel now. Look for Firearms Fuel and Fabrication

What twist rate is your 8.5" barrel?

Where do you get the 12.1 gr for SMK? Sierra says 11.8 gr for 1050 fps.

Where did you find the load data?

Do u think the chrono hanging on the barrel is effecting accuracy?

Carbine gas isn't reliable for 300blk, pistol gas tube works best in my tests, 8.5 barrel, 13.6 barrel.

Do you convert your own 5.56 brass to .300 Blackout?

How do you keep your chrono strap from melting onto your can? My Sig silencer gets hot.

What is important about 1050 fps?

President wow awesome super great WGS GUNSHOP that ammonium best better wow is good self defense and great hunting season wow powerful shoot making 300 blackout subsonic that round wow awesome a lot fun.shooting there “fantastic the load defense this country wow excellent anyway we have a nice day!

How much do you bump the shoulder back?

It took about 4 minutes and 45 seconds for you to state what cartridge you are working up loads for. I believe it would be more helpfull to state the cartridge at the begining of the video. I almost clicked away from your channel.

100 yards????