Group for evaluation. . . UPDATED 12/14/10

[cowboyarcher]

Hi all,

Here's the pre-bedding group:

http://i403.photobucket.com/albums/pp112/cowboyarcher/Photo_111710_004.jpg

What does this group tell you about the rifle? I've always wanted to figured out exactly what stringing is caused by.

I have a hunch on this one, but I will keep it to myself for a while, so as not to bias opinions. Everything is solid though, scope, screws, etc.

And here is the post-bedding group:

http://i403.photobucket.com/albums/pp112/cowboyarcher/100_4846.jpg

What do you guys think is keeping these groups opened up like this?

Adam

[1Shot]

...Wind or lite load...

[cowboyarcher]

No wind (oddly enough) at 100 yards. . . 22-250 and 45 grn JHP's, factory Winchester ammo.

[1Shot]

...lol... factory fodder it does'nt like... :)

[Captain Finlander]

hot barrel or cold barrel string?

[1Shot]

..I would go with heat also if it was fired in a string...shots are # but I can not read them..If it was reloads, I'ld still say powder..But then again I'm not behind the trigger..So take it for what it's worth..

[cowboyarcher]

It's a SS fluted factory varmint barrel. . .

Would contact with the barrel channel cause this? It sits in an unbedded Duramaxx and has the typical right side contact, pretty hard actually.

[Captain Finlander]

Yes, contact with the barrel will cause this type of patterning.

[cowboyarcher]

Yes, contact with the barrel will cause this type of patterning.


So is the contact causing the action to shift in it's bed, or just weird vibrations, causing the stringing?

[1Shot]

Yes, contact with the barrel will cause this type of patterning.


So is the contact causing the action to shift in it's bed, or just weird vibrations, causing the stringing?


..+1 vibrations..

[pdog06]

Yup, just changing the harmonics of the barrel. Although a dirty barrel will do this also.

[dcloco]

Rifle resting on a bag that does not capture the forearm correctly and/or not having the rear bag capturing the rear of the stock will also do this.

Don't have the correct front bag?....shoot off a bipod.

Need an extremely cheap set of bags? Garage sale jeans of...well....TALL women with slender legs. (don't laugh!!)

You can make four to eight bags out of women's jeans...depending on their height. Cut the legs into for or eight pieces (12 to 14" length works best), sew one end closed (double stitch it), insert a doubled up plastic grocery bag, fill with sand, tape the bag shut with duct tape, double stitch the end of the bag....PUT YOUR NAME ON THE JEAN BAG IN PERMANENT MARKER....and start using.

[Nefarioud]

Need an extremely cheap set of bags? Garage sale jeans of...well....TALL women with slender legs. (don't laugh!!)

You can make four to eight bags out of women's jeans...depending on their height. Cut the legs into for or eight pieces (12 to 14" length works best), sew one end closed (double stitch it), insert a doubled up plastic grocery bag, fill with sand, tape the bag shut with duct tape, double stitch the end of the bag....PUT YOUR NAME ON THE JEAN BAG IN PERMANENT MARKER....and start using.


I hereby award you the Martha Stewart award for shooting excellence :D

About the group, How quickly was it shot? Can you number the shots. I have done rapid fire groups and documented POI shifts and change in barrel temp. and tried to correlate these with their effect on the accuracy nodebecause I had nothing better to do, the results were similar.

[dcloco]

Need an extremely cheap set of bags? Garage sale jeans of...well....TALL women with slender legs. (don't laugh!!)

You can make four to eight bags out of women's jeans...depending on their height. Cut the legs into for or eight pieces (12 to 14" length works best), sew one end closed (double stitch it), insert a doubled up plastic grocery bag, fill with sand, tape the bag shut with duct tape, double stitch the end of the bag....PUT YOUR NAME ON THE JEAN BAG IN PERMANENT MARKER....and start using.


I hereby award you the Martha Stewart award for shooting excellence :D

About the group, How quickly was it shot? Can you number the shots. I have done rapid fire groups and documented POI shifts and change in barrel temp. and tried to correlate these with their effect on the accuracy nodebecause I had nothing better to do, the results were similar.


LOL!

[cowboyarcher]

If I had to put an order to them, from left to right, it would be: 3, 4, 2, 5, 1

I was shooting off of a bi-pod and rear bag, in the snow and sage brush, as fast as I could get them cycled in a single shot fashion.

[Captain Finlander]

That is kind of important information and with it I am going to say it is human error. Seeings how it is a lateral string you might be pulling the trigger ILO squeezing it.

[Russ]

+1

[cowboyarcher]

That is kind of important information and with it I am going to say it is human error. Seeings how it is a lateral string you might be pulling the trigger ILO squeezing it.


Are you saying I cannot shoot?? ;) Just kidding.

I was curious if such a string typically came from human influences, or from an equipment issue. Guess it could be some of each.

When I get my AR together (gotta have a rifle ready for coyotes) I'll take the time and bed the action right and try to post another group.

[Nefarioud]

If I had to put an order to them, from left to right, it would be: 3, 4, 2, 5, 1

I was shooting off of a bi-pod and rear bag, in the snow and sage brush, as fast as I could get them cycled in a single shot fashion.


Looks very similar to mine but mine went down and left. My groups that is

[oldguy]

Never had much faith in producing consistent groups with a bi-pod.