Barrel Behaviour Theory

Get or give advice on equipment, reloading and other technical issues.

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Bigtravoz
Posts: 109
Joined: Sat Apr 22, 2017 7:43 pm

Re: Barrel Behaviour Theory

#76 Postby Bigtravoz » Tue Jun 12, 2018 8:11 pm

Has anyone thought also about the negative pressure vacuum that is created which also causes mass turbulence as the projectile leaves the barrel? Or is this an unknown to you guys?

After the muzzle blast there’s also a massive drawback into the muzzle. Don’t know if it will be relevant or if anyone has considered the disruption it causes, but to understand it you need to have led a bit of a distorted past an build a poly pipe cannon. Without loading a projectile, charge the chamber and ignite the charge with your hand over the end of the barrel. No it won’t hurt you! You will experience an initial expansion pushing your hand away but it will be followed by a very strong vacuum sucking your hand back to the muzzle. Try it.

Bigtravoz
Posts: 109
Joined: Sat Apr 22, 2017 7:43 pm

Re: Barrel Behaviour Theory

#77 Postby Bigtravoz » Tue Jun 12, 2018 8:22 pm

Whatever people choose, it always comes back to the nut behind the butt and what you feel most comfortable shooting.

Nah some rifles are just dogs Dave and it doesn’t matter who’s pulling the trigger! We proved that the other weekend.

williada
Posts: 729
Joined: Wed Jul 22, 2009 12:37 am

Re: Barrel Behaviour Theory

#78 Postby williada » Wed Jun 13, 2018 1:29 am

Trav ask yourself when does the mass turbulence occur, how is it formed in different stages and where is the pressure exerted on the projectile? Then you will understand its significance. Then consider a TR shooter who uses perspex rings in the rain. Why do they get drop build up on the front sight when the bullet has gone?

Unfortunately you bought a very old Omark in poor condition which has nothing to do with your shooting skill as you have demonstrated with a sound rifle. I am surprised you did not check it out or ask someone before you bought it. All is not lost, parts are cheap and a person with your machining background should be on track when you identify all the issues, step by step. It's a learning curve mate. You will benefit from the experience until you get a Barnard.

Bigtravoz
Posts: 109
Joined: Sat Apr 22, 2017 7:43 pm

Re: Barrel Behaviour Theory

#79 Postby Bigtravoz » Wed Jun 13, 2018 6:56 pm

williada wrote:Trav ask yourself when does the mass turbulence occur, how is it formed in different stages and where is the pressure exerted on the projectile? Then you will understand its significance. Then consider a TR shooter who uses perspex rings in the rain. Why do they get drop build up on the front sight when the bullet has gone?

Unfortunately you bought a very old Omark in poor condition which has nothing to do with your shooting skill as you have demonstrated with a sound rifle. I am surprised you did not check it out or ask someone before you bought it. All is not lost, parts are cheap and a person with your machining background should be on track when you identify all the issues, step by step. It's a learning curve mate. You will benefit from the experience until you get a Barnard.



Yeah unfortunately I didn’t think it was as bad as it is. It was always going to be a learning experience and I wanted something to test me out.

!Peter!
Posts: 99
Joined: Sun Oct 30, 2016 6:35 am

Re: Barrel Behaviour Theory

#80 Postby !Peter! » Wed Jun 13, 2018 11:01 pm

Bigtravoz wrote:Has anyone thought also about the negative pressure vacuum that is created which also causes mass turbulence as the projectile leaves the barrel? Or is this an unknown to you guys?

After the muzzle blast there’s also a massive drawback into the muzzle. Don’t know if it will be relevant or if anyone has considered the disruption it causes, but to understand it you need to have led a bit of a distorted past an build a poly pipe cannon. Without loading a projectile, charge the chamber and ignite the charge with your hand over the end of the barrel. No it won’t hurt you! You will experience an initial expansion pushing your hand away but it will be followed by a very strong vacuum sucking your hand back to the muzzle. Try it.


Here's a picture of a bullet leaving a rifle.
https://www.researchgate.net/figure/Left-The-muzzle-blast-and-supersonic-bullet-from-firing-a-Remington-30-06-caliber_fig3_253222217

Might help you to visualise what's happening.


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