Anyone here into firearms?

JWillis72 · 05-24-2015, 07:49 PM

It's not always high, I don't own a can that doesn't shift a gun a little.

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Rusty · 05-24-2015, 10:20 PM

Quote:

Originally Posted by JWillis72

It's not always high, I don't own a can that doesn't shift a gun a little.

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Everyone I know that has a muffler, including me. All shoot high because of the increase in velocity. Usually about 150fps. Have heard of a few that the point of impact shifted left or right also.

ImportConvert · 05-25-2015, 08:37 AM

Quote:

Originally Posted by Rusty

Everyone I know that has a muffler, including me. All shoot high because of the increase in velocity. Usually about 150fps. Have heard of a few that the point of impact shifted left or right also.

I have never seen that documented. Every single documented comparison shows VERY MINIMAL freebore boost, as I said in my other post.

I would challenge you to show this to me, this 150fps increase. As a datapoint, all of the rifles I've suppressed shoot low with the can, to varying degrees. Again though, it's just harmonic variance. YMMV of course. The 150fps increase though, is many times what I've seen proven.

Here is one example: http://www.youtube.com/watch?v=LwnG1dz0Du0

Rusty · 05-25-2015, 09:47 AM

Harmonics plays a part of it too. Just never say it in the post. Sorry. Since you mentioned it. I'm going to have to check out my buddy's chrono that we used against another one just to see the difference between the two.

Out of 14 of us that have mufflers. 11 shoot high. One shoots to the left some, and the other 2, who knows.

Rusty · 07-25-2015, 11:05 PM

Quote:

Originally Posted by JWillis72

It's not always high, I don't own a can that doesn't shift a gun a little.

Sent from my iPhone using Tapatalk

Quote:

Originally Posted by ImportConvert

My t2 dot is very crisp magnified. My t1 dot was a diagonal slash. Unmagnified they were the same. T2 works very well magnified. T1 not so much.

On this rifle I got about a 2moa shift with the suppressor.

Quote:

Originally Posted by Rusty

High with the muffler? With everything being the same.The suppressor usually increases bullet velocity. Which makes the bullet fly flatter.

Quote:

Originally Posted by Rusty

Everyone I know that has a muffler, including me. All shoot high because of the increase in velocity. Usually about 150fps. Have heard of a few that the point of impact shifted left or right also.

Quote:

Originally Posted by ImportConvert

One of my cans shoots a touch higher than the other. I believe it's straight down, though, as a whole, with this can on this gun.

What you're talking about is "freebore", and it's typically less than the variance from shot to shot in velocity increase, and some suppressors don't have any appreciable freebore effect. At the extreme edge you're looking at about a 20fps increase or so on rifles, maybe 30-50 with a pistol.

No, the POI shift has to do with changing the barrel's harmonics, and there is no written rule.

Quote:

Originally Posted by ImportConvert

I have never seen that documented. Every single documented comparison shows VERY MINIMAL freebore boost, as I said in my other post.

I would challenge you to show this to me, this 150fps increase. As a datapoint, all of the rifles I've suppressed shoot low with the can, to varying degrees. Again though, it's just harmonic variance. YMMV of course. The 150fps increase though, is many times what I've seen proven.

Here is one example: http://www.youtube.com/watch?v=LwnG1dz0Du0

Quote:

Originally Posted by Rusty

Out of 14 of us that have mufflers. 11 shoot high. One shoots to the left some, and the other 2, who knows.

On this topic. Found out some stuff. Some, if not all was using different loads when we was testing bullet impacts with the cans. So the results that I was looking at was crap.

Had a chance to redo this with a couple of the guys using the same loads, and my new Chrono. Impacts had very little change (1/2 MOA at the most), as did the velocity (10~25 on the avg). All of this is on 3 AR15's shooting .223/NATO, and 1 AR10 in .308. The assumption was that I thought the guys all was using the same loads for testing with/without the cans. You know when you assume something. You become the first 3 letters in that word.

05-25-2015, 09:47 AM	#4 (permalink)
Rusty Ronin Samurai - Assassin Join Date: Dec 2011 Location: Fayettenam,Pennsyltucky Age: 69 Posts: 35,504 Drives: 2011 Nismo GM 6M Rep Power: 2684439	Harmonics plays a part of it too. Just never say it in the post. Sorry. Since you mentioned it. I'm going to have to check out my buddy's chrono that we used against another one just to see the difference between the two. Out of 14 of us that have mufflers. 11 shoot high. One shoots to the left some, and the other 2, who knows. __________________ 浪人 - 殺し屋 "The Difficult Anytime, The Impossible By Appointment Only" http://www.the370z.com/members-370z-...o-journal.html

05-24-2015, 07:49 PM	#1 (permalink)
JWillis72 A True Z Fanatic Join Date: Sep 2013 Location: Fort Myers FL Posts: 2,002 Drives: 2009 370Z yellow 7AT Rep Power: 45	It's not always high, I don't own a can that doesn't shift a gun a little. Sent from my iPhone using Tapatalk