What can cause "key-holing"??

[merlinnnn]

I was sighting in a GAP AR-10 for a MK 4 scope. In getting on paper two shots of South American R1M1 ball ammo "keyholed" the target... I had previously shot this ammo for the initial on paper for the BUIS with no problem...

What could cause this??

Merlinn

 

[Queequeg]

Re: What can cause "key-holing"??

What distance were you shooting? Any difference in recoil in the latter rounds? How old is the ammo?

Maybe some of them had cocaine in the cases as a new way to smuggle it in to the country.

 

[merlinnnn]

Re: What can cause "key-holing"??

I was sighting in at 100 ammo is about 10 years old..

 

[Queequeg]

Re: What can cause "key-holing"??

I bought 9 boxes of Chilean 7.62 NATO last summer for $3.00 a box (20 rounds) thinking it would be good for plinkage. As it was easily more accurate out of my stock AR-10A4 than my new Remington and Winchester hunting loads I made a point of saving a couple boxes out of ....spite...I don't know.

Anyway, only thing I can figure for keyholing, in your case, would be ammo quality deteriorating for any number of reasons, or bullets made by the cheapest bidder

. I damn sure don't think it's your rifle.

I was just goofing on the South American theme. Sorry...

 

[SNIPERALEZ]

Re: What can cause "key-holing"??

I had that happen to me too. LINK
My Dos Centavos, Ed

 

[merlinnnn]

Re: What can cause "key-holing"??

I shoot it through my GAP M40A3 to get close then finish with FGMM 168 or 175 to finish, never had that happen...

 

[Victor Co Heather]

Re: What can cause "key-holing"??

Wrong bbl twist and bullet weight can cause key-holing. What the heck are you shooting surplus ammo out of a GAP for anyway? Bad doggie!

 

[cew191]

Re: What can cause "key-holing"??

twist seemed to be the reason it happened out of my .243 and my 22-250. Went to lighter bullets problem solved. Sure there are other reasons but this was the best explanation I have.

 

[NaHa]

Re: What can cause "key-holing"??

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: merlinn</div><div class="ubbcode-body">I was sighting in a GAP AR-10 for a MK 4 scope. In getting on paper two shots of South American R1M1 ball ammo "keyholed" the target... I had previously shot this ammo for the initial on paper for the BUIS with no problem...

What could cause this??

Merlinn </div></div>

Dang, that is odd. (And I hope you weren't shooting at the range in your area that enforces the 3mph speed limit!!!! Talk about annoying!

I've never seen keyholing except for transonic issues at 900+y with a .308 that was running out of steam. Keyholes at 100y? And it shot okay in the same rifle before? Maybe a way-low powder charge in questionable ammo? Or maybe the bullets saw that damn 3MPH speed limit sign, and they slowed down to match...

 

[cms81586]

Re: What can cause "key-holing"??

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: M.45</div><div class="ubbcode-body">Wrong bbl twist and bullet weight can cause key-holing. What the heck are you shooting surplus ammo out of a GAP for anyway? Bad doggie! </div></div>

Good surplus is fine to shoot. Been shooting SA surplus for the steel shoots I've been doing. Holds to 1.5 MOA out to 1K so I can't ask for more.


CMS