corn er key holling

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murphies_finest
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corn er key holling

Post by murphies_finest » 07 Sep 2009, 16:52

someone please explain to me what is "keyholing"?
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Vortec MAX
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Re: corn er key holling

Post by Vortec MAX » 07 Sep 2009, 16:55

When the bullet hits the target sideways :?:

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Re: corn er key holling

Post by Grantness » 07 Sep 2009, 17:13

It can happen when you use bullets that are too heavy/long for the FsN (or what have you) to stabilize. Faster twist barrel, longer barrel, and adding more velocity are ways to fix the problem....and of course, you could use lighter bullets. Its odd, the conflicting reports that I've heard. Most people will tell you that the FsN won't stabilize a bullet over 55gr. Then I see load data for 60 & 70+ grain subsonic loads...that they say weren't keyholing. :?:

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Rapier1772
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Re: corn er key holling

Post by Rapier1772 » 07 Sep 2009, 17:21

An unbalanced bullet will sometimes yaw and tumble (or if the barrel twist isn't correct) ; this is usually seen as "keyholing" in the target. The bullets leave elongated holes in the target as they strike at an angle. Once the bullet starts to tumble, accuracy is gone since the bullet will veer off in random directions. Not extreme changes for minute of bad guy distances though.

Here's a pic
http://www.kaneohegs.com/images/apr_23_9b.jpg" onclick="window.open(this.href);return false;
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Re: corn er key holling

Post by murphies_finest » 07 Sep 2009, 17:25

okay great input was reading the bad press about my tantal and had no clue as to what it was since alot of folks were complaining of this with the CIA rifles I have not checked mine on for that on the range yet other than fired to make sure it worked.
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Re: corn er key holling

Post by Wollychop » 07 Sep 2009, 17:35

Keyholing can ALSO occur if something happens to the bullet after exiting the barrel, such as a baffle strike.

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Re: corn er key holling

Post by murphies_finest » 14 Jan 2010, 10:54

well my CIA polish tantal keyholes yay! as far as solving the problem goes im going to purchase a bulgarion parts set from atlantic firearms for about 300 thats cheaper than i have seen in the shotgun news.
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Re: corn er key holling

Post by VITALIY » 15 Jan 2010, 09:01

What kind of ammo you shoot? If it is anything like surplus 53gr, than you need a new bbl, if it is 60+ gr, than yor bbl may be ok, and all you might need to do, is switch to a lighter bullit. Soviet block 70's surplus is a good one to try. I must tell you, it is dirty as hell, but function 100% :laugh:

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Re: corn er key holling

Post by murphies_finest » 15 Jan 2010, 12:06

VITALIY wrote:What kind of ammo you shoot? If it is anything like surplus 53gr, than you need a new bbl, if it is 60+ gr, than yor bbl may be ok, and all you might need to do, is switch to a lighter bullit. Soviet block 70's surplus is a good one to try. I must tell you, it is dirty as hell, but function 100% :laugh:
Im pretty sure it is the 53 grn bullet i bought a tin of 1080 for about 160 from the gunshow but i may try a heavier bullet. but really am gonna get the parts kit from atlantic
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Re: corn er key holling

Post by VITALIY » 15 Jan 2010, 12:31

Now i,m 99.9% sure it's the shot out bbl. If the bparts kit is bulgarian, it must be good. I have RPK74 and AKS74 both build on bulgarian parts kits. Both function flawless.
I wish you a good luck. I know first hand how frostrating this kind of thing may be.

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Re: corn er key holling

Post by fatherfoof » 15 Jan 2010, 18:52

Speaking in general of all manner of handguns, since ammo from the factory varies so much, it is unavoidable. When we pushed troopers with issue weapon and ammo through qualification, we had almost none. However, since we made them also qualify on their personal off duty weapons, it was amazing how frequently quality guns would slap the target with name ammo. This is hundreds of troopers in a three week span and they all had a couple personal guns. One really can't assume all the correct caliber will be flawless in every gun.
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Re: corn er key holling

Post by VITALIY » 15 Jan 2010, 20:34

fatherfoof wrote:One really can't assume all the correct caliber will be flawless in every gun.
I agree.

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Re: corn er key holling

Post by murphies_finest » 12 Apr 2010, 07:27

Update I am shooting the 53 grn ammunition, as a quick fix I broke down this weekend and "shudders" purchased some wolf ammuntion the 60 grn ammo test fired my rifel at 15 thirty inch paces (we know its not accurate) without any keyholing and then I took it out to 45 paces and still no keyholing so i think it may be safe that im good to go with my rifle now and all I did was purchase a 6.75 box of 60 grain and a new front grip for 10 dollars.
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Re: corn er key holling

Post by murphies_finest » 14 Apr 2010, 05:29

I put two sets of speakers out to 70 paces used one for 53 grn (pics coming soon) and one for the 60.

53 grns went in clean and came out sideways hard to tell for a portion because shots were close together.

the 60 grn went in clean and came out clean.
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Re: corn er key holling

Post by User42 » 14 Apr 2010, 11:00

That sounds like good news, how many rounds did you test fire for each? If the 53 grain rounds are hollowpoints, they are intended to tumble in the target and you are only really worried about rounds entering cleanly.

Why shuddering about buying some wolf ammo? It's made on the russian military machines, and is actually cleaner to shoot than the 53 grain surplus considering it isn't corrosive. Now it's time for some 100 and 200 yard accuracy tests!
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Re: corn er key holling

Post by murphies_finest » 14 Apr 2010, 11:58

User42 wrote:That sounds like good news, how many rounds did you test fire for each? If the 53 grain rounds are hollowpoints, they are intended to tumble in the target and you are only really worried about rounds entering cleanly.

Why shuddering about buying some wolf ammo? It's made on the russian military machines, and is actually cleaner to shoot than the 53 grain surplus considering it isn't corrosive. Now it's time for some 100 and 200 yard accuracy tests!

I test in groups of five its easier for me to track, the 53's are not HP and are really hit in miss sometimes they keyhole and other times they dont on paper, with the compensator off the 53 grn can be placed in the barrel up to the case mouth, whereas witht he 60 grn wolf there is a bout an 1/16th-1/8 gap between barrel and case mouth. Im am well aware of the wolf being cleaner than the military ammo by far but it is still some dirty stuff! i know you know this.
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