Seeing the hit

[J E CUSTOM]

While doing recoil test the slow motion videos show something very interesting
and I thought I would share with everyone.

https://www.youtube.com/watch?v=_W4HviShfEs

Interesting .

J E CUSTOM

 

[Rhyno]

I think I'll never use a lead sled again. Hard to say if the 300 RUM flexing on that area was for the muzzle brake or being clamp pretty solid.

Though it did appear that the top ports may cause issues, as well evident in the 300wm test.

 

[505Fire]

Wow now that's interesting. Never thought a brake would affect the barrel so strongly.

 

[J E CUSTOM]

I think I'll never use a lead sled again. Hard to say if the 300 RUM flexing on that area was for the muzzle brake or being clamp pretty solid.

Though it did appear that the top ports may cause issues, as well evident in the 300wm test.

We had to restrain it in order to see the effects of down force.

I have a 338 RCM with a top port brake on it because it was bucking due to the weight of the rifle (6 lbs) and after several shots offhand I saw the ground under the game. my friend commented that he could feel the 300 RUM pushing down while firing. decided to go back and do more test
and video them. the results are what you see.

I have had bedding screws work lose and could not understand why, I think I know now.

Thanks

J E CUSTOM

 

[tomcat mv]

That is very interesting, thanks for posting. The stock wrist flexing is quite impressive (as in disturbing).

 

[garandman]

THAT has been a public service message.

Thanx for a very helpful video.

 

[RobertB]

Awesome video man. Thanks for sharing. I choose to deal with recoil on most rifles. I was always concerned about breaks with uneven ports. Never had proof I was just always under the impression that everything around the muzzle needs to be the same all the way around, like the crown.

 

[J E CUSTOM]

Awesome video man. Thanks for sharing. I choose to deal with recoil on most rifles. I was always concerned about breaks with uneven ports. Never had proof I was just always under the impression that everything around the muzzle needs to be the same all the way around, like the crown.

Thanks.

There are a lot of fine shooting rifles with top port brakes so this is an effect that happens after the bullet exits the brake.

My main concern was what happens to the bedding and the stock over time. even with heavy barrels the down force is still present, and applying this force to the stock and action.

I have had bedding screws lose there torque and have heard of stocks braking in the pistol grip(Wrist) area and assumed that they were
related to abuse. There was a comment about never using a lead sled again. I don't add weight to mine and don't recommend adding any to the lead sled because I feel it is hard on the stock and bedding .but with the top ports improperly
sized I am not sure it would make any difference. even if the rifle is on sand bags down force will still have the same effect.

One of the guys commented that it looked like the first test (The 300 Win Mag appeared to flex in the wrist
area. After looking again I agree. (Good Eyes, Thanks).

Off hand shooting would help minimize the effects but the rifle will still be pushed down.

Just my opinion based on what I see now.

J E CUSTOM

 

[surffly]

Really think its that much of an issue?
I watched a video once of an aircraft propeller under a strobe light and it was crazy how much the metal was bending, but clearly planes still fly

 

[BERTMAN77MK2]

Wow, awesome video!

 

[Pointman308]

I don't think that comparing aircraft prop blades that are made out of aerospace aluminum with the sheer dynamics of what's going on in a rifle barrel is a good way to explain this away. Muzzle brakes are still an unperfected science look how many winning competitors don't use them.

 

[varmint slayer]

I don't think that comparing aircraft prop blades that are made out of aerospace aluminum with the sheer dynamics of what's going on in a rifle barrel is a good way to explain this away. Muzzle brakes are still an unperfected science look how many winning competitors don't use them.

Depends on the discipline of shooting really. 6/10 of the top 10 shooters at the PRS finale last year were using a brake.

 

[damoncali]

Interesting. I could not see any flexing in the grip specifically - it looked like the whole stock bent to my eye. But the question of top ports (or any asymmetrical ports, really) driving barrel vibration is an interesting one, and probably worth looking into in more depth. How much is it happening before the barrel leaves the muzzle, for example?

 

[J E CUSTOM]

Interesting. I could not see any flexing in the grip specifically - it looked like the whole stock bent to my eye. But the question of top ports (or any asymmetrical ports, really) driving barrel vibration is an interesting one, and probably worth looking into in more depth. How much is it happening before the barrel leaves the muzzle, for example?

I have seen very high speed videos of the bullet leaving the barrel before any perceptible movement takes place . That's why it does not appear to hurt accuracy. It is the other effects that bothered me.

There is a new video coming out soon with some very high speed video that should answer that question. As soon as it does I will post
it for all to see.

There is still lots to be learned about Muzzle brakes as far as I am concerned.

J E CUSTOM

 

[damoncali]

I have seen very high speed videos of the bullet leaving the barrel before any perceptible movement takes place . That's why it does not appear to hurt accuracy. It is the other effects that bothered me.

There is a new video coming out soon with some very high speed video that should answer that question. As soon as it does I will post
it for all to see.

There is still lots to be learned about Muzzle brakes as far as I am concerned.

J E CUSTOM

It certainly seems that the bedding may be getting worked over more than necessary at the very least. Really good stuff. Keep us informed. You also have to wonder what effect it has on follow through or perceived recoil.

 

[lash]

That is very interesting. I haven't yet used a muzzle brake but have been considering doing so. I can see that I should spend a bit more time researching before making a choice.

 

[TucsonAustin]

I am in the same boat as lash. I plan on purchasing a brake soon. However Due to you research I now will narrow down my options. I do not want to compromise the integrity of my action bedding however slight it may be. Thank you for publishing this.

 

[onethousandmeters]

Thanks for publishing this video. Like TusconAustin, I'll look at narrowing down my options or choices when choosing a brake. Did NOT know that 6 out of the top 10 shooters at the PRS finale were using brakes. Interesting.

 

[Low_drag]

This would not happen under normal shooting conditions because it's not rigidly constrained to a lead sled. He should do the same test from bags with a person on the stick.

 

[sgtsmmiii]

This would not happen under normal shooting conditions because it's not rigidly constrained to a lead sled. He should do the same test from bags with a person on the stick.

My thinking, too. With that much weight on the lead sled, that recoil energy has to go somewhere ( and since the buttstock is tied down, the wrist is the thinnest portion of the stock ). I would think that a shooter being pushed rearward would dissipate much of that stock flex.

 

[J E CUSTOM]

This would not happen under normal shooting conditions because it's not rigidly constrained to a lead sled. He should do the same test from bags with a person on the stick.

Shooting off hand and out of a deer stand was what brought it to out attention.

You can feel the rifle pushing down and see the target move up.

Shooting off hand or off a soft rest would probably be easier on the rifle but the down force would still be there.

Doing the test off a Lead Sled was the only way to video and be sure it was happening. shooting off hand was
two subjective and depending on the shooter for his opinion is not a good test. also it showed how much force is applied to the rifle. we even talked about some way to actually measure down force at the muzzle and never
came up with a means to do so. so we relied on the video to be consistant and impartal

After changing brakes there was no down force felt when shooting off hand and the same test proved that.

Like I said earlier; I liked the top port brakes and installed them for years but I have since changed my mind, and prefer to eliminate the potential problems associated with them (There are enough problems maintaining accuracy as it is).

J E CUSTOM

 

[JByrd]

I always steered away from the top ports purely from a harmonics point of view. im with ya on this one JEC,its gotta be beatin em to pieces.

a quality brake when it is designed well and functions properly is a VERY good thing.

 

[FALex]

thanks for posting, that was damn interesting. Where did you find the Assassin brake?

 

[J E CUSTOM]

thanks for posting, that was damn interesting. Where did you find the Assassin brake?

I Designed and make them, I also Tune the ports for the Maximum recoil reduction.

We also tested other side port brakes with no top ports that were very good but elected not to show them because even though they were better
than most they did not do as well as the Assassin and we did not want to target other brakes, Just show the performance of the Assassin.

The progressive ports with the ability to tune the brake gives it an Edge and with so many good brakes available the only reason to get an Assassin is for Maximum recoil and sound reduction.

The fact that It can be custom Tuned for the rifle weight,bullet weight, velocity and powder charge make it a Custom brake at less than some brakes prices.

I am retired and just wanted to improve something that I never liked (Muzzle brakes) and had to think outside the box to dispel all of
the existing rules of muzzle brake design. With lots of research and help from my friends I have been pleased.

If you have any questions you can E Mail me At [email protected].

J E CUSTOM

 

[scudzuki]

Really think its that much of an issue?
I watched a video once of an aircraft propeller under a strobe light and it was crazy how much the metal was bending, but clearly planes still fly

If you are examining the effect on the components (fatigue), perhaps, but the title of this thread is seeing the hit.
At least in the circumstances tested here, it would be much easier to stay on (or return to) the target without the top ports in the muzzle brake, that much is clear.

Joe

 

[Low_drag]

I agree with what's happening JEC. I just don't think the rifle takes near as much abuse because allot of the energy is translated to the shooter. I see why you did it the way you did though.

 

[J E CUSTOM]

I agree with what's happening JEC. I just don't think the rifle takes near as much abuse because allot of the energy is translated to the shooter. I see why you did it the way you did though.

There is no doubt that the abuse will be less when shot off hand or off a soft rest, but the down force will still be present.

The next time we set up to test I will try to see if we can see any perceivable flexing of the stock or the barrel while shooting without a lead sled.

As we know it now, the larger the cartridge, the more down force. And the smaller cartridge size the less effect the top ports have on the rifle
because of the amount /volume of gas.

As I said earlier, there is still much to be learned about muzzle brakes as far as I am concerned.

Keep the comments coming, They are welcome.

J E CUSTOM