12ga. Sabot FLECHETTE that REALLY impressed us 

I love how the 12 gauge is such a bizarre round. From dragons breath to basically armor piercing you can load anything that will fit in the shell.

home made APFSDS

Certainly, the most impressive performance from flechette rounds I've ever seen. Accuracy was WAY off the charts! I think they are ready for commercial production.

At subsonic speeds this could be used with a suppressor which is kind of scary suppressed round penetrate armor

Just take a moment to consider this: a fragmenting hollow point flechette. Sounds like something out of a sci-fi movie.

I really appreciate that you and Greg take the testing seriously, without taking yourselves too seriously. Lots of fun to watch

I was absolutely shocked that it penetrated that 32 lb lead even after watching it go through that military grade tactical vest but that hollow-point what it did to the meat and the ballistics gel wow those are some immensely powerful rounds! great vid keep up the good work guys 👍

I will be 100 percent honest, I thought your channel fell off the face of RU-vid until I opened up RU-vid today and saw this video. Definitely glad you are still doing your thing. Great job guys

This might be one of the best performing projectiles you have tested lately.

The search seems to be complete. A shotgun projectile that behaves much like a rifle round. A long distance trajectory map at a higher velocity would have added dimension to the video. Great work!

Great video. Impressive rounds. Thorough joy to watch you two in action.

If I recall, the small mirror helped with taking more accurate selfies in the earlier days of cell tech.

I wonder if they Fly well at any Distance? Or With a 1500 FPS plus load … the weight of these makes it possible to fire them with a high FPS …I like to see more of these rounds tested….they are Very impressive…

Man that was really shocking. I'm used to seeing flechettes, even ones that are sabot stabilized, being wildly inaccurate and tumbling and just not being effective. Some amazing work there by Alexei, and you did one heck of a job loading them so that they performed well. Also, I think it would be really cool (and shocking) if you and OG traded places for one video. You shoot and he man the camera. Just as a surprise for us all.

I absolutely love the shots fired at the blocks of clay in all of your videos... the are beautiful shots in slow motion

That background music at the start was so Awesome!...relaxing and soothing, amazing choice guys

These were really impressive. When I saw they were made by Alexey, I had a feeling they’d be special. The guy makes some really good stuff. Thanks for showing them!

These two projectiles certainly warrant further testing.

Wish those were sold commercially. I'd definitely buy some.

Thats one of the best tests Ive seen you guys do,Those things are deadly great video see you on the next one

These rounds perfectly exemplify why the Armor Piercing, Fin Stabilized, Discarding Sabot rounds are the mainstay of our M1A Abrams MBT fleet. Hats off to the Alexi for such amazing projectiles. Great job loading the rounds, and awesome video, guys!

That sigh after OG says, "Ran a train!" made me laugh a bit more than it should have!

the lead plate is just such a great target imo, it shows just so much of the ammo's characteristics in an easy to understand way

Those are sweet rounds, great job sharing with us thank you.

I haven't had high expectations on these flechettes, so I was all the more surprised by the excellent accuracy and penetrating power. Really impressive.

Those things are shockingly effective and because of the light loads it would be devastating in an automatic shotgun in close quarters combat. 😬 Mixed loads would overwhelm anything you could reasonably face. An AP version could be made from tungsten. It's a game changer.

The irony of a show like this being made in California, still continues to amaze me :-).

More Alexey, yay.Your careful, methodical, goofy testing is great. Thanks, guys.

Very impressive projectiles. Sub-sonic and still penetrating the lead plate. Who would have thunk it :)

I dont know what i expected, but i cant say i'm surprised. It's basically a 12 Ga SLAP round, no wonder it penetrates even when subsonic.

Thanks for your videos, I always enjoy.

Been watching a few years. Your experiments are definitely getting better. That frangible round would be a deer slayer!!

The dad jokes are strong in this one. Lol. I hope to some day get to come down and shoot with you guys. Hope everyone is staying safe and staying well.

It's basically APFSDS for shotguns (Armor Piercing Fin Stabilized Discarding Sabot is mostly found in some tank loadouts)

You two deserve more views!!! Great projectile.

I think that's one of the most remarkable rounds you've ever tested. This was spy / sci-fi stuff in the seventies and eighties, and when I got older, I was so disappointed they didn't exist. And now you have flechettes that don't just work, but work well.

Imagine what a supersonic, tungsten alloy variant can do !

Wow. These were awesome. props to the designer.

Truly an amazing two styles of rounds. More please.

This has got to be one of the coolest ones ever out of all your prototype vids. Those things are stupid impressive. And anyone who knows knows Greg is a fantastic shot. 99% of the time it's the physics of whatever slug he's shooting.

”Gaping meat hole” was actually the name of my burlesque all male Cancan show group back in the days… 🤣

The aim for the face shirt is awesome OG! Great video also those fletchets are really cool !!

would never have guessed that round could do that!!! wild! fun test gents!!! 🤘🏻🤘🏻

The terminal ballistic performance was surprisingly good for both the penetrating and expanding rounds, given that only 10 grains of powder were used resulting in subsonic velocities. It makes me wonder what the performance would be like if the same design was CNC machined from solid brass (or cast brass for production rounds), with a solid base and a shot cup designed to accelerate the projectiles without damage, and 20+ grains of powder for supersonic velocities with an exponential bump in kinetic energy. I love the TAOFLEDERMAUS channel because you guys are doing the experiments I'd like to do. I'm a hoplophilic engineer with a lot of reloading equipment and I've done many wacky ballistic experiments in the past, but none lately. Thanks for these practical lessons on the lunatic fringe edge of ballistic science.

For the next test of the Flechettes should be a range test out to as far as they will fly accurately and penetration test at range as well! Maybe start at 25 and work up to 100 yds!

I want some of those! Thanks for the scientific testing!

FINALLY! I've often wondered why no one ever set their 2 liter bottles up that way. That's the only way I shoot mine. It's fun to hit the cap and blow the entire bottom off the bottle. As usual, you guys rock.

Just a prediction: Flies like a Dart and sheds fins on impact. Could be cool in ballistic gel test for additional damage. Penetration is going to rely heavily on how cranked up the “ mass Excellerator “ cranked up and how well the sabot forms a seal in the barrel. I give it a 8.5/10 that it will preform extremely well.

I would be very interested to see these with a full powder load.

Thats so gnarly! Thats basically just a tank round! Great video!

I remember when i used to try to explain the interesting complexities, and questions, about ballistics to folk who weren't much in the know...then there was fledermice. I don't bother saying much, these days, till after I've sent the links. Then you wait a few days for them to catch up, and jump ahead to far meatier, more interesting, subject depths. Half the time, there's another video on the channel, to flush that out aswell. This is the wealth of information i used to dream about

A flechette that’s effective out of a shotgun; it’s like we’re living in the future.

Hey Jeff and OG! Thanks for all of the great entertainment over the years. The humor, the testing, the interaction with your viewers, and what I can only imagine tons of editing and learning. I'm am terribly sorry for the absence of Danny. I hope everyone is well, and I'll be here for the next video :-) (and most likely this one again). - A Fellow Jeff

I feel like this shows we still have stuff to learn about ballistics. This slow little brass tube can clear through stuff some rifle rounds can't, and it doesn't tumble in fluids.

Hey guys, some years ago I had the drawings for a very similar dart load, except the shell casing was made of stainless steel and there was a roll crimp (permanent) w cuts for the fins. The shell casing was reusable, the dart sat on a polymer disc which was supposed stay in the shell. This was supposed to be a quiet round. The kit came w the dart & plunger disc, you had to have Maxine or have machined the shell casing. Accurate to 60 yards was claimed. The firing discharge was meant to almost totally contained inside the stainless steel case, the reducing the report.

That shot through the helmet is extremely impressive, same with the lead plate

I love how the aluminum fins are stuck in the lead plate. It's like Alexey autographed his work after yet another successful penetration.

Thanks, Guys! I look forward to seeing your videos.

I enjoy the Dad jokes as well with your commentary really appreciate it guys thank you keep rolling out them videos.

Even funnier than OG jokes is when he really gets Jeff laughing hard with one. It's contagious when Jeff busts out laughing.

I went back and at around 17:09 it looks like there was a shard that broke off and was stuck inside the meat. Regardless, this was a very cool test, I'd like to see some more of these tested at higher velocities.

Love the channel and thanks for another great video!

OK, a hollow point flechette is the most terrifying round I've seen so far.

I’m never unimpressed by the rounds you guys test. It’s always so cool to see these really odd and creative rounds. Keep it up! 🤘🏻

Insaneo style There were more accidental innuendos than usual in this video

These rounds are the ammunition equivalent of "a tornado driving a piece of straw through a telephone pole". Amazing!

Wow these things are super effective this is just mind blowing.

Thanks guys that was very entertaining. I wasn't expecting the darts to be that accurate. The angled vs flat plate impact test was an awesome demonstration of the sloped armor principal. Keep up the good work lads I had a great laugh while learning stuff!! Cheers !

These seem to fly like a rifle bullet. Would like to see how they would do at a long range target of say 50 yards and how they would preform if fired with a hotter load.

A excellent view much appreciated, absolutely cool Slugs & Sabot Loads for the shotgun! Cheers !🤝🏼✌🏼

I truly do appreciate everything you all do

I'm a degreed engineer and have been shooting and loading ammo for over 40 years and all I can say is that I'm stunned at the results of this. I don't want to call what you did luck. Clearly, it was experience that told you what to load and how to load it but the odds of you getting such spectacular results on each and every shot seemed rather low. It's not that this hasn't been done before on a larger scale, it has, but you were able to make it work right off without blowing the dart apart or any of the million things that would have caused the projectile to fail. Thank god you resisted any temptation to fire one down a rifled barrel.

I'm really surprised by the performance of these being subsonic! Impressive.

This is now one of my favorite rounds you guys have tested. Thanks for the awesome content.

Interesting as always!

You two guys are terrific!

Very impressive!

And this is why the 6.5x55 Swedish Mauser has been killing Scandinavian moose for just short of 130 years. Ditto other 6.5mm cartridges. Great sectional density & penetration, they kill all out of proportion to their paper ballistics, and they don't need to be driven super fast to kill stone dead!

Outstanding duo.

OG makes me laugh every time he introduces himself. this is very good work

I would love to see that accuracy at range! That was totally awesome. I was gobsmacked when it went through the Lead Plate like it was butter! Keep em coming Alexi!

Wow. Alexei is the man! True genius. Good loading too 👍

Great stuff... Good info, good banter... Keep it going.

One word awesome ,keep up the fine videos

Probably one of the most promising looking Slugs I’ve viewed on this channel it has real potential in the hunting and law enforcement scene would really like to see this round made commercial if it can still be accurate at around 1700 to 1900 ft./s

Nice to finally see a flechette that was well balanced. Seems like all the ones you normally see just tumble through the air.

Always very interesting and entertaining. Thanks

I want some of those! They work very well and I am surprised how accurate!

Dude, this is cool af. I was waiting for the day you guys would get your hands on a good, working flechette round.

That round is insane! Certainly the best fletchette round I've seen on your channel. And the wound channel from the fragmentation round was damn scary .

Thank you both Jeff and Greg

Outstanding research gentlemen!

Man that Alexey guy really hits some home runs with his designs, these 2 knock it out of the park in a lot of aspects and the non frag round is a beaut. Gregg, your handling of Jeff's Fleshette is always a joy to observe and I enjoy both of your waffling on in the video's.

The round had me impressed 👏🏻 They did way beyond what I thought especially the speed awesome 👏🏻, great episode guys👍

YOU GUYS SHOOT SOME OF THE CRAZIEST PROJECTILES!

For all the philology this is an excellent channel for ballistic analysist

Sometimes less is indeed more. Being subsonic means very clean release of the discarding sabot. Nice job and thanks for sharing.

These 3D printed custom sabots are highly underrated.

Whoa. Sailed right through all that lead and Kevlar. Pretty impressive.

Great video! Thanks for the music mentions too. :)