What Suppressors Really Do To Velocity 

I think hanging a weight on the end of the barrel might something to do with the groupings

I think the chrono disturbs the muzzleblast,and may be affecting the bullet stability. I'm no expert, it's just my guess. Either that,or like others commented, it messes up barrel harmonics by it's weight. But since the suppressor captures most of the muzzle blast, it might be the reason why groups improved with the suppressor.

8:55 That reduction is probably due to the vacuum created behind the shell by the 26" maxing out and the hot gas in the suppressor started cooling and contracting. Gen 1/backpressure suppressors have no alternative but the breach and barrel, so the bullet is sucked back till the seal is broken. Common in airsoft when tuning the gear speed on the pneumatic piston. The extreme length and weight on that 26" with a thin long suppressor and the long mounted chrono adds a ton of weight on such a long arm it shifted down that much. Just needs some tuning. Long range/accurate shooters are warry of any touch on the barrel. The PoI from a suppressor, non free-float, barrel pressure from barriers, and a bunch of weight, especially from a non supressor. All of that screws with the barrel harmonics

You mean games have been lying this while time? I thought suppressors reduced performance not increase it 😂

Good test, I was expecting a greater velocity increase with the suppressor than what the results revealed.

My wild guess is the magnetospeed, with varying tightness to the barrel, adds inconsistency to your barrel harmonics, and the suppressor mass helped stabilize the barrels.

I love how you come out with exactly the information I'm looking for, just as I'm looking for it. Excellent job dude ,

Your videos, comments and different zoom/slow motion effects are terrific.

Dang good thing I wasn't betting on the results! I would have lost the farm. As with all of your videos, there are so many lessons learned. One for me, is reconsidering hanging various items way out the barrel on tactical riffles. Especially, after considering some of the quite wise thoughts already in this thread. Great video as always!

Wonderful test and review! I remember buying my only 44 mag cases for reloading, from USA Midway back in the 1980's! I still use the ones I bought from them today. They are stamped with: USA Midway on the bottom. I have reloaded everyone of those cases 8 to 10 times so far!! Good work on the video.

Great test I wouldn't have expected those results

You actually used the word "efficient" correctly. Congratulations. Most gun guys think it's interchangeable with "effective", when it's truly not.

Thanks for the 10mm selection!!

Your videos are awesome keep it up

the important thing is, it didn't make the velocity worst.

Good experiment.

Cool beans... Good test

Appreciate that you make jokes about your shooting and include footage of things not always going smoothly. When your channel gets big just don’t start acting like some of the other gun channel guys. Don’t need you acting all rich and better than everyone else like some others we know!

If all the guns had horrible groups shot on the same day, chances are it’s most likely shooter error. It wasn’t a good day for you to shoot. It happens, no big deal. I just wouldn’t have told the whole world about it! You’re an honest man, sir! I appreciate that! Thanks for the video!

What a great question I know I've been wondering.

I'm curious as to whether the magneto hanging on the barrel was affecting barrel harmonics, causing the large groups. Then adding the weight of the suppressor helped to mitigate some of that loss in accuracy.

My favorite gun, Channel. Keep up the great content cheers from Canada 🍻

Great demonstration here. Not using a sbr or sb pistol tho was a real missed opportunity being that the dividends for burn in barrel would be greatest, and the use case with suppressors most common on that rifle variant now.

It's the contraption on the end of the barrel that's causing the bullets to scatter. It interrupts the natural oscillation of the barrel. Try it without it, then see what your groups are.

Never heard of a suppressor increasing velocity, but good to see the data anyway.

Would be interesting to see the effect of a flow thriugh suppressor on a semi

I think if you want to see a velocity increase from a can its important for the can's caliber to closely match whats being fired. As in a can that can do 7.62 & 5.56 will not change much with a 5.56 but would add more to a 7.62

Accurate 2495 works well with a 16” barrel. I run it through my ptr with no problems and it doesn’t have a gas system. I’ve run up to 42 grains in NATO cases. Also your groups are bad because of the magneto speed. It does it to me as well. That’s why when I do velocity tests I don’t worry about the groups. I tune that in with seating depth.

The 7 mag had a 26 inch barrel. All the powder was burned at 26 inches. Adding the silencer length decreased velocity due to the 26 inch barrel

That strap-on chrono is upsetting barrel harmonics and opening groups. It is also wiggling about from muzzle blast in a way that makes the velocity readings suspect.

Your groups open up because of the harmonics changing from mounting of that chrono… specially on your barrel. On shorter than optimum length barrels for the peak burn of that load or cartridge… suppressor can add velocity. Howerer on longer barrels where peak powder burn is maximized… a suppressor likely will lessen the velocity. As for poi shift and accuracy a good suppressor gun combo on a good rig should add accuracy or does not affect it with minimal to no poi shift. Kinda like functioning as a barrel Tuner if you get lucky.

Hi Banana, You should paint the shield just in case shrapnel hits it and you can show it to us.

I got that chrono when it first came out , it’s still in a box in the garage somewhere. Would have been great for public ranges and what not . I ended up wanting to shoot at it more than shoot with it .

I just stumbled upon your videos and I love them. Can you do a 7.62x25 vs 9mm on steel plates. Thank you I can provide ammo if needed.

So, it looks like the longer barrel rifle was getting a more complete burn of it's powder to the point it ALL burned before the bullet exited the weapon. The suppressor allowed the air to more fully expand and cool so a rarefaction was created in the barrel and the pressure behind the projectile dropped instead of continuing to increase.

You need to get some oversize thread protectors so the MSV3 does not slide down the barrel shot after shot. That movement will affect the groups as the harmonics change with each shot. Typically I see POI shift with the MSV3 on the barrel, but groups can shrink or increase.

I believe the issue with your bench accuracy is your sled is moving quite a bit, and in some of your shots you see the bench come off it's feet as it walks, along with the back feet coming off the table. Weigh that sled down, get it to not move, and your bench accuracy should improve.

When I use a sled my groups are terrible …. I can shoot better off sand bags… interesting video I was thinking the other day does a suppressor effect velocity 😊

Suppressors and even your chrono would have a big effect on the harmonics of the barrel and thus the accuracy and point of impact.

i did notice that your magneto speed was moving forward only without supressors, that can be doing big groups

10:11 that 7mm rifle had like a 4' barrel on it. The powder was burned by the time the bullet made it down the barrel.

definitely assume the chrono made groups open up for sure.

Magneto working as "tuner" on barrel, not a surprise at it blows groups.

You might want to add some lead, or sand, to your lead sled. The gains or losses seemed to be within the extreme spread of each cartridge fired. None were significant, but reducing muzzle blast and flip should assist with repeatability, even if it "cost" a tiny bit of speed.

I think you would have better bench groups if ya put some sort of weight on your lead sled. 😅

10mm is the starting point for pcc... Spicy is the best taco

The chronograph on the end of the barrel affects the barrel harmonics, causing erratic groups

Got to love those simi automatic bolt action rifles . LoL 😂

@8:42 I've never had any luck with the 5 or so calibers of Superformance I've tried.

BRAIS❤👏 308win cartridges 110gr- 125gr- 130gr- 135gr- 145gr- 147gr- 150gr- 155gr- 165gr- 175-gr- 180gr-185 gr VS MILD STEEL PLATE.👍❤.

I've never seen any rifle shoot small groups 1/2'' with any factory ammunition. When I started handloading, my groups went to 3/4'' or less...

Your sled jumps about a lot!

If you need any body guards from those assassins let me know..... 😎 I'm thinking you're just needing some practice shooting. Is everything you have that loose? Maybe a slower trigger pull? Good video. ❤ Keep it up. Your channel is growing nicely. 🎈🥳🎈

Please do a 6.8 spc vs 5.56 vs 7.72x39.

That chronograph attached to a barrel might be affecting the accuracy.

Your Chrono is the culprit for your groups most likely

That bee wanted to get into the video so bad it crashed right into your forehead😂

Think you need a traditional chronograph. First time I've seen this type in decades of shooting and years of watching videos. I'm all for new tech designs but there is a reason people use the other type.

The better groups probably had to do with it being more pleasant for you to shoot by suppressing sound and recoil and has nothing to do with its structural characteristics. The 7mm load may have been optimized for that barrel length such that adding the suppressor interfered with the velocity. The same thing happens with a 1911 and a Thompson SG using ww2 era ball ammo. That ammo is maximized for the 1911 but is not powerful enough to gain any extra velocity with the extra barrel length and instead actually runs out of juice as it moves down the extra barrel length, resulting in slower velocities. Try doing this with a chrono that does not hang off the barrel. One that is a separate unit that measures velocity as the bullet flies through a more open air apparatus (the kind Paul Harrel uses on his videos). Why ? it's the same reason why ww2 Soviet riflemen qualified and always shot with their bayonet fixed to their weapon because the presence of the bayonet altered their point of impact from shooting without the bayonet, and they were often required to do bayonet charges by their commanders.

I've always wondered if you cut baffles into a barrel and built a can over it, so the bullet is still spinning in the rifling, would it add velocity, I'm sure it would be more accurate than if that extra barrel length was a regular suppressor

I'm just spit balling here but maybe try a more traditional chono. It would take a minor pressure off the weapon and the shooter. Just a thought.

My friend, you should have shot a group without either the suppressor or the magnetometer on it to see if they were affecting accuracy. Hanging that thing way out on the end of the muzzle may have completely goofed your harmonics.

can you do 30.6 vs 8mm round test.

You need the new Garmin Xero

What velocity did you get on that banana bro. Was needing a new calibre for some deer action.

Having the chrono strapped to the barrel can mess up the barrel whip and create accuracy issues.

Barrel temp? Did it change from 1st to last? Was the fire rate higher or lower with the semis auto? Is the barrel weight different?

I have the same Remington 700 long range in 7mm rem mag…….what exact model or part did you use for your detachable magazine kit?

So... this is subjective as fare as accuracy goes. The difference is not nessasary better or worse because of a suppressor. What you're essential doing is adjusting the barrel harmonics. You'd get similar results with weights or a barrel tunner.

Did you use a 9mm suppressor with the 9mm and a .30 cal suppressor with the .308?

Not much if you have a hux... The difference isn't actually "back pressure" but dwell time. Traditional baffles keep pressure in barrel longer. Flow through like hux 90ish% reduction still way better than the best sig and about 70% reduction from a trad baffle.

What suppressors were you using?

Alot of the issue with the groups is the rest your using has no stability looked like it was rocking(left and right not front and back) on every shot

The rifles seem to be jumping around a bit? Maybe that affected the groups?

I have a 7mm REM Mag. Before my suppressor the bullet would travel through the animal but now with the suppressor the bullet blows up internal but no exit hole? Why is that?

Letting that magneto thing touch the barrel messes with the harmonics and widens your group

Wondering, if you have an adjustable gas block on your AR10 and set it so gas does not cycle the bolt, in a 1:1 scenario (using 18” barrels), would a non-cycle semi-auto have the same velocity as a bolt action? This is only to theorize, using an AR10 as a pseudo bolt using an adjustable gas block with the ability to open the gas for semi-auto when/if needed. Just curious…

at least in 6.5 creed you seem to lose speed at 26 inches compared to 24. Maybe the same on 7mm.

Today's lesson: Suppressors increase accuracy.

Is there a difference between short and fat suppressors over long and skinny?

So I thought there was a vid compareing 308 bullets on steel? Is that pulled?

Subsonic 9mm with suppressor hearing safe? How about .45?

I wouldn't call 29fps "substantial. It's like 2%

Lmao!!! Tea bagged by a bee!!!

You can’t shoot for accuracy with a magneto-speed attached to the barrel - it changes the barrel harmonics with every shot!

Chrono is flopping all over the place

man sounds like barry white.

It adds about 10 fps on 5.56 as well

you should change measuring device it definitley affects barrel behaviour and thus making point of impact test imprecise

I’d say if EVERY gun you shoot has a wide group,, it’s NOT the guns lol

Honestly your group sizes were pretty small so i wouldn't make any conclusive statements. But ammunition costs money so more testing gets expensive.

Silencers, also known as suppressors, or “fule filters” (that’s Amazon’s spelling😂)

bro shoots bananas 🍌 way more accurately then bullets 🕳️ 🎯 🕳️ 🕳️

what I've noticed in shooting elr is that the can doesnt really do all that much in terms of velocity when youre running the same load, but it more so allows you to get a hotter load and still a full clean burn. It's basically a modular barrel length option or it allows you to get more "barrel length" past the point when the friction of the rifling would start to slow your projectile down when you look at it in terms of velocity.

😎👍👍👍😎

5.56 13.5in barrel and you will see proper fps increase

🙂

30fps at those speeds would not make any difference

Its the thing bouncing around on the end of your gun duh

@Banana Ballistics - With regards to pistol velocities and suppressors: The largest change in velocity by far will be induced by the following scenario. You have a stock Glock 19 (just giving an example, could be any pistol that doesn't come stock with a threaded barrel or barrel long enough to be threaded). The barrel is not threaded and it is doesn't protrude enough beyond the front of the slide to allow you to have that barrel threaded. So you purchase an aftermarket OEM or third party threaded barrel. It will be approximately 0.5 inches longer in order to accommodate the threads. 4" vs 4.5" will cause a significant and measurable increase in muzzle velocity in almost all pistol chamberings. This velocity increase will overshadow all velocity differences caused by other factors related to adding a suppressor. I understand that this was not the case in this video, as all shots were fired through the same threaded barrel. I'm just trying to elucidate where some of the conventional wisdom or myths about suppressors significantly increasing pistol velocity may have originated. EDIT: You should absolutely shoot a group for precision WITHOUT your chronograph attached. Think about how important barrel crowning is on a rifle and then imagine what kind of havoc is wreaked on the precision when you have a giant airfoil dangling off the end of the barrel for 1 foot. I'm guessing the extreme downward shift from the 7mm Mag was due to the longer 26" barrel being affected more by barrel whip/harmonics changing from mounting the suppressor. The longer moment of force means a higher magnitude in oscillation and maybe you caught it at the very bottom of its oscillation pattern, causing an extremely low shift in POI.