Moldy,

this tumbling and lose of accuracy was pointed out by an old gunny sgt. in Veitnam..

It seem this was a feature in the original design.. had 1;16 twist in the rifling. changed a bit later to 1;12.. For the military..

commercial AR-15, which are M-16 made cheaper, often still have the tumbling problem..

If you look at a gun site on line you can find endless argument about it..

My opinion---I using an older version or a newer cheap version of the rifle. Tumbling will be common and has been found in several of the killings..

Use a modified military or high end version, then not so much..

My thinking is that both you and Dr. Evil are right.. and I think that most users are at the cheap end of the scale.. So, yes, the tumbling makes the round more devastating..



Sample from---https://thefiringline.com/forums/showthread.php?t=587626


Tumbling bullets in the AR-15
Following the shooting in Virginia, before it was clear what weapon was used, another fellow surmised it was an AR15 and related the devastating wound was probably due to the bullet "tumbling."

It is my impression that "tumbling" dates back to the Vietnam era and the introduction of the AR15 with a 1:14 twist that stabilized a 55gr bullet until it hit the target, then tumbled due to yaw and instability. At greater distances the accuracy was poor and the twist was changed to 1:12. I have a 1:7 twist and I don't see any keyholes at any distance. So my position was if the shooter used a modern AR15, tumbling was not part of the equation.

But the other fellow says he has both a 1:7 and 1:8 twist and both rifles tumble his bullets of ALL weights.

What do you other shooters think?

Moldy,

this tumbling and lose of accuracy was pointed out by an old gunny sgt. in Veitnam..

It seem this was a feature in the original design.. had 1;16 twist in the rifling. changed a bit later to 1;12.. For the military..

commercial AR-15, which are M-16 made cheaper, often still have the tumbling problem..

If you look at a gun site on line you can find endless argument about it..

My opinion---I using an older version or a newer cheap version of the rifle. Tumbling will be common and has been found in several of the killings..

Use a modified military or high end version, then not so much..

My thinking is that both you and Dr. Evil are right.. and I think that most users are at the cheap end of the scale.. So, yes, the tumbling makes the round more devastating..



Sample from---https://thefiringline.com/forums/showthread.php?t=587626


Tumbling bullets in the AR-15
Following the shooting in Virginia, before it was clear what weapon was used, another fellow surmised it was an AR15 and related the devastating wound was probably due to the bullet "tumbling."

It is my impression that "tumbling" dates back to the Vietnam era and the introduction of the AR15 with a 1:14 twist that stabilized a 55gr bullet until it hit the target, then tumbled due to yaw and instability. At greater distances the accuracy was poor and the twist was changed to 1:12. I have a 1:7 twist and I don't see any keyholes at any distance. So my position was if the shooter used a modern AR15, tumbling was not part of the equation.

But the other fellow says he has both a 1:7 and 1:8 twist and both rifles tumble his bullets of ALL weights.

What do you other shooters think?

I can't answer to the fellow with 1;7 and 1;8 twist other than he must have extremely barrels. The original M16s had 20" barrels with I believe 1:16 twists and they were shooting mostly 62 gr. bullets that wouldn't stabilize in flight. They changed to 1;12 twist which still wasn't spinning the round fast enough for it to stabilize so they switched to 55 gr. bullets and the stability and accuracy improved.

If you google 5.56 terminal ballistics in gel, you'll get an idea of what happens when a round hits a human body. Most of the time, because of the speed of the round they fragment. Mike

I will keep my semi-automatic weapons thank you. Especially considering the dollar is racing to the sum of zero thanks to the Democrat Communist party and their Rino pals over the last 100 years. If you cant see what is happening around you and the ploy to disarm the population before the bonds crash, you are not as smart as I thought you were.

Per usual, a fcked up human went mental and people like you politicize it to disarm tens of millions of hard working, law abiding citizens. Fck America and the Bill of Rights, right? Isnt that what little Democrat tyrants like yourself want? To be controlled and taken care of by the billionaires as long as you get a single payer system? Lol

With all the freaks/geeks, self entitled spoiled brat leftist, Islamic terrorist, ANTIFA thugs and a very overzealous government controlled by a small plutocracy of criminal billionaires set on world domination, I will keep my human rights (or whats left of them) to defend myself with my puny semi-automatic sporting rifles. These wespons are far far from military grade but its all we have to fend off threats to our families and communities!

Do you even know anything about firearms? Do you know what "AR15" represents? Do you know why the NRA was formed in 1871? Do you know the NRA is America's longest-standing civil rights organization since you have been trained to have guilt for even existing? Do you personally know anyone at the NRA-HQ before you say they have splattered childrens blood on their faces Or are you just going to continue to ride the great lie that is being presented to you daily by the plutocracy and their Ministry of Truth? Wise up man, the financial fcking of all time is right on top of us!