Ragged Bullet Holes

Y

yat3b35

Guest
Can anyone explain why a bullet will give a very ragged hole at 100 yards and a clean cut hole at 200 and 300 yards ? The bullet in question is the Bib 118 10 ojive .308 bullet out of my 30br. I get very good accuracy at 100 but the holes are very ragged. At 200 & 300 yards the holes are very uniform with very little tearing of the target . I realize that my accuracy is not being hurt , but just wondering why the difference in the holes. Could it be that they are not fully stabilized at 100? I'm getting 3035 fps at 15 ' from the muzzel. My groups are normally in the low 1's at 100yds and sometimes in the 0's , best was .098" . The holes are not always ragged either and that's when I can get the best groups. My 6ppc doesn't tear the target the way the 30br does.
This is not a big deal to me , but just wondering if anyone would like to speculate , or could answer the question. Thanks , John
 
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The target backing material usually causes the ragged holes...try using some Coroplast...it is the corregated plastic used on disposable signs..and windflag vanes...it will support the target paper and will self heal after the bullet passes thru...some paper contributes to ragged holes, and a good rigid backer is required...such as Coroplast...give it a try...;)
 
My barrel is a 17 twist Kreiger , and I see the same results at most ranges I shoot at. Most of the time I'm shooting at regestered matches. Today I was at a local ground hog shoot with rubber backing.
 
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yat,

Sometimes you can flatten the paper out and find where the meplat impacted the paper. Have you tried this?



FfFffbBRRRrrraAAnnscissSSSSS!!!!!!,

HO mon'!

Snowing up there yet? :D




offf my gourd :mad::mad::mad: pfaugghhhhhhh.......... I have not yet BEGUN to sputter......


LOL

al
 
There was a post here recently (or in PS I can't remember) that talked about when a gun is in tune the resulting bullet holes "appeared" to be smaller than the actual caliber...or just more clean and were actually representing the true caliber of the bullet when apposed to the out of tune bullet hole.

Don't know if this has anything to do with what you're seeing or if it is truly a matter of the type of backer being used. Have you measured the holes to compare?
Mike
 
Like I said , it's really no big deal , but was just wondering. Thanks to all for your thoughts and replys , John
 
Hey, I find it very interesting :)

There have been articles on the subject, in most cases it's a yaw phenomenon which I why I'm asking about the meplat impact points. It's generally accepted as "fact" that "hummers" cut smaller holes at close yardages.


Of course one must believe in hummers, and be a little loose with the term "fact" ................but I'm a believer.


FWIW, if it's yaw then the question becomes WHY? Neck clearance? Bullet pull? Primers? Leade angle? lackamoly?

dunno..............

Then there's:

-ragged crown
-damaged bullet base from nasty necks
-damaged base from fast powder
-VLD's
-fluctuations in the flatusphere
-phnomeutetric irregularities, conditional
-tantric imbalance

etc......


I wish some more folks would chime in.


al
 
Alinwa, tell us

Please, Mr. Alinwa, tell us more about "tantric imbalance." Please?
 
I have heard about the flatusphere theory before. It is defined as a low level, high pressure system typically preceded by consumption of highly fibrous material. When released, the competitors immediately adjacent are subjected to a subsonic shockwave that causes the barrel frequency to be altered in such a way as to cause the projectiles to quiver in flight...hence your "ragged hole". The flatulator is protected at ground zero due to the "down and out" deflection of the shockwave.
It's still a mystery as to why the 200yd targets are OK.
HTH,
Mike
 
Probably

the flatulator has a corresponding ragged hole. The whole thing about raggedy holes is wholly, obtusely on the ragged edge of science.

And, please Al, clue us with some definitions.

Dennis
 
:eek: What have I done !? :D
I did see where hecksf ( Ted ) mentioned there were no good posts lately , so I started this one.
Interesting thoughts by all , Thanks , John
 
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Here Is My Honest Answer.

I don't have a clue.
That being said, there is always the possibility that the bullet is not completly stable at 100, most of us don't worry about this as long as the bullet hits that dot in the middle of the moth ball, or goes in the group............jackie
 
I just read all of the "flatusphere" posts...............I'm literally in tears from laughing so hard. I especially like savet06's post. Priceless.

-Dave-:)

BTW, My bet is the backer; spicifically Dick's take......the 100 yd frames get more use than the 200's.
 
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If you try to stabilize the bullet too quickly, you can drive the base of the bullet into 'base shake'.

You need to set the clutch up a bit soft for the first two stages and then pick up the engagement rate quickly as you past the 60 ft. clocks. If you let the base start to shake, you're toast unless you catch it quickly and back pedal it. The holes might still be ragged at the end but at least you'll be in the next round.

Ooops...wrong sport. :D -Al
 
Al Nyhus said:
If you try to stabilize the bullet too quickly, you can drive the base of the bullet into 'base shake'.

You need to set the clutch up a bit soft for the first two stages and then pick up the engagement rate quickly as you past the 60 ft. clocks. If you let the base start to shake, you're toast unless you catch it quickly and back pedal it. The holes might still be ragged at the end but at least you'll be in the next round.

Ooops...wrong sport. :D -Al
Click to expand...

Al, lets not forget that more air pressure (in 1/2 lb increments) can also help to tune out the dreaded shake.:)

-Dave-
 
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