Posted on 04/06/2014 5:01:59 PM PDT by Carriage Hill
Funny thing, Poly barrels look worn out when they are brand new.
Here’s some good points....
Not compromising the barrel’s thickness in the area of each groove as with traditional rifling.
Providing a better gas seal around the projectile as polygonal bores tend to have a slightly smaller bore area, which translates into more efficient use of the combustion gases trapped behind the bullet,[5] slightly greater (consistency in) muzzle velocities and slightly increased accuracy.[2]
Less bullet deformation, resulting in reduced drag on the bullet when traveling through the barrel which helps to increase muzzle velocity.
Reduced buildup of copper or lead within the barrel which results in easier maintenance characteristics.
Less sensitive to stress concentration induced barrel failure.
Prolonged barrel life.
Yeah, if you didn’t know it was a poly barrel it looks like it’s “shot out”.
I think Lead build up is an issue, but I think poly works like a hose.
That is the first thing I thought when I looked over a brand new one.
No lands and grooves.
Doesn’t lead expand? No where to go in poly.
Still a good reminder.
As I said, I an no physicist.
All I know is Glock says do not use lead nose bullets and I have seen their guns blow if you do.
Very good info here.....
http://en.wikipedia.org/wiki/Polygonal_rifling
I’m not smart enough to get technical.
No doubt. It was kinda humorous occurring in the same thread.
Have a great week.
Is that the same as button rifing?
A hammer forged barrel is the most durable, I think.
I don’t know for sure but this is from Wiki........
The hammer forging process produces large amounts of stress in the barrel that must be relieved by careful heat treatment, a process that is less necessary in a traditionally cut or button rifled barrel. Due to the potential for residual stress causing accuracy problems, precision shooters tend to avoid hammer forged barrels, and this limits them in the type of available rifling.
Here’s a good article on polygonal barrels.
http://firearmshistory.blogspot.com/2010/05/rifling-polygonal-bore-and-whitworth.html?m=1
It’s like Chevelle SS’s, Camaros, Vettes and Women.
Everyone has an opinion.
Very good write up. Thanks!!
Have a good and safe week!
Thanks again for the coverage CH.
Spent the weekend with FReepers and am still trying to cover the bases.
Thanks for filling in.
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