Barrels and Bullets: Conventional Versus Polygonal Rifling

[Annihilator]

Nice read on the difference between conventional vs polygonal rifling, good read for the new gun owners as well as seasoned shooters

Barrels and Bullets: Conventional Versus Polygonal Rifling

The bore of a gun barrel with conventional rifling is etched with corkscrew-like cuts. Each cut, or

bearingarms.com

 

[TEXASforLIFE]

Glock's reasoning as for higher velocity in their guns. I've never used lead or even gas checks. What are gas check limitations in pistols? Probably not good in semi's.

 

[Pitdogg2]

Glock's reasoning as for higher velocity in their guns. I've never used lead or even gas checks. What are gas check limitations in pistols? Probably not good in semi's.

I was not aware gas checks were used in semi auto pistol. I was under the impression that they were used in higher pressure revolver lead bullets to mitigate lead erosion at the base.

 

[TEXASforLIFE]

I was not aware gas checks were used in semi auto pistol. I was under the impression that they were used in higher pressure revolver lead bullets to mitigate lead erosion at the base.

I thought the checks were used for better sealing behind the bullet? I was just curious if any had been used in semi's? Revolvers and lever guns is a yes on checks (or I've been told). Not my territory.

 

[Pitdogg2]

I thought the checks were used for better sealing behind the bullet?

Yes as to my comment on lead erosion. Hot plasma jets will cut through, the gas check will mitigate that. They are not necessarily used at lower velocity like cowboy loads or with harder higher antimony bullets.
And that is about all I know.
Just enough to be dangerous . I've never loaded any lead projectiles, just copper jacketed.

 

[youngolddude]

I mostly shoot lead and will not likely wear out any barrel from shooting. Polygonal rifling must be for handguns only, since distance rifle shooters use traditional rifling. Reloaders do not save money, they just shoot more for an amount spent.

 

[HansGruber]

I mostly shoot lead and will not likely wear out any barrel from shooting. Polygonal rifling must be for handguns only, since distance rifle shooters use traditional rifling. Reloaders do not save money, they just shoot more for an amount spent.

HK uses it in some of their rifles; the PSG1 sniper rifle, for instance, had a poly bore.

 

[Old_Me]

i too shoot a lot of lead, with FMJ too. i do a mix each time. but this also goes to my cleaning after every range visit, to remove as much lead as possible each time too.

do i still have microscopic lead deposits in ANY barrel that ANY of my guns have?

i'm sure i do, but i also do not shoot tons of ammo every time at the range. i'd have to wonder from the article, how often the barrels are cleaned, and he also does go on to say competitive shooters, may experience issues, as it is, they do shoot thousands of rounds yearly, compared to my (and others) minuscule hundreds.

 

[Bassbob]

I don't know about issues, but I wouldn't. I don't shoot lead in anything.

 

[TEXASforLIFE]

I used to shoot semi-jacketed in a revolver, but don't own it anymore. That was it on exposed lead. I guess I've enough lead exposure?

 

[Annihilator]

An Official Journal Of The NRA | Should You Shoot Lead Bullets in Glock Barrels?

With the cost of ammunition being what it is, I have had to go back to reloading my 9 mm practice ammunition using any components I can find. I got a really good deal on some hardcast bullets and picked up several thousand for current and future use in my Glock G17s, of which I have several...

www.shootingillustrated.com

Good article

 

[Bassbob]

I used to shoot semi-jacketed in a revolver, but don't own it anymore. That was it on exposed lead. I guess I've enough lead exposure?

Semi jacketed ( commonly referred to as jacketed as opposed to full metal jacket) do not put lead fouling in the barrel as the lead never actually touches the barrel.

 

[TEXASforLIFE]

Semi jacketed ( commonly referred to as jacketed as opposed to full metal jacket) do not put lead fouling in the barrel as the lead never actually touches the barrel.

I realize that. It was just the nose. Just in a semi-auto the lead will/can deform some when loading because of the angle. I know several peeps like them (all lead or semi) in their 45's. I'm just choosing not to use any. IF I had a revolver I might shoot some lead (hardcast) in a 444M or 45-70.

 

[TEXASforLIFE]

Some manufacturers seal the exposed base on bullets for their reasoning. Lapua and a few American companies do this.

 

[Bassbob]

I realize that. It was just the nose. Just in a semi-auto the lead will/can deform some when loading because of the angle. I know several peeps like them (all lead or semi) in their 45's. I'm just choosing not to use any. IF I had a revolver I might shoot some lead (hardcast) in a 444M or 45-70.

I have and will shoot jacketed in revolvers, but only FMJ in semi-autos.

I didn't mean to come off like I was schoolin' ya brother. Just clarifying for any other members who may be reading this and not know the difference.

 

[TEXASforLIFE]

I have and will shoot jacketed in revolvers, but only FMJ in semi-autos.

I didn't mean to come off like I was schoolin' ya brother. Just clarifying for any other members who may be reading this and not know the difference.

I figured so. Good reference for those who don't know.

 

[youngolddude]

HK uses it in some of their rifles; the PSG1 sniper rifle, for instance, had a poly bore.

I stand corrected then. But what about long range shooters, the bench rest guys? Do any use polygonal rifling?

 

[HansGruber]

I stand corrected then. But what about long range shooters, the bench rest guys? Do any use polygonal rifling?

No idea; don’t run in those circles.

 

[Recusant]

I stand corrected then. But what about long range shooters, the bench rest guys? Do any use polygonal rifling?

Well, they did at one time:

https://www.youtube.com/channel/UCefQw7bLRPKSG-qx9dJroew