In order to participate in the GunBroker Member forums, you must be logged in with your GunBroker.com account. Click the sign-in button at the top right of the forums page to get connected.

VERTICLE GROUP

jeshebajesheba Member Posts: 102 ✭✭
edited June 2003 in Ask the Experts
I'm finding my groups wandering up suddenly???? No windage variation!Then back down again??? What used to be a 1/2 group is now 1/2 inch wide and 2 inches long??? Checked all the nuts and bolts and everything is tight. Rifle is a 6mm Remington 700 VLS,Burris 8x32 scope,Burris rings on weaver mounts,Choate stock and Rifle Basix trigger.I wait at least one minute between shots. Also noticed I lost some velocity and found some improvement in the verticle variation when I loaded some lighter loads with,of course,even less velocity.This velocity change threw me another curve. I'm shooting Hornady 75 grain V-max (moly),H-414 powder,winchester mag primers in Remington brass.At 47.0 grains I was getting great groups at 3500 fps.This dropped to about 3350 and then went back up to 3480 two days later. (anbient temp??) A friend thinks I have the Choate stock attached too tight.I'm wondering about the scope. Everything worked fine early this spring and now the bottom fell out! The rifle only saw about 100 rnds this spring and now this! HELP! I'm probably confusing the issue with two unrelated problems but want to relay all the facts. Thanks for listening !

Randy Summers
· Share on FacebookShare on Twitter

Comments

  • MIKE WISKEYMIKE WISKEY Member Posts: 10,046 ✭✭✭✭
    edited November -1
    i can see three possibilities #1. stress on the barrel, barrel warms up group goes up, #2 scope problem, try a different scope, #3. fouled barrel (least probable) clean the heck out of it and try again.
    · Share on FacebookShare on Twitter
  • cody45cody45 Member Posts: 570 ✭✭✭
    edited November -1
    vertical stringing is almost always the fault of bad bedding or incorrect bedding. thats why benchrest shooters use "glue-in" actions and free floated barrels.
    · Share on FacebookShare on Twitter
  • JustCJustC Member Posts: 16,056 ✭✭✭
    edited November -1
    I would look for velocity variations or how my hold on the rifle changed from shot to shot.

    Cheek pressure or pressing into the bag will cause that, if it is not consistent. I have some of that happening right now.

    Inconsistent neck tension will result in differing velocities.
    Inconsistent powder charges will cause that also.



    why chase the game when the bullet can get em from here?....
    Got Balistics?
    · Share on FacebookShare on Twitter
  • jeshebajesheba Member Posts: 102 ✭✭
    edited November -1
    I CAN'T BELIEVE HOW I SPELLED "VERTICAL" I GUESS IT WAS TO EARLY IN THE MORNING! VERTICLE???? OH BOY!

    Randy Summers
    · Share on FacebookShare on Twitter
  • chuckchuck Member Posts: 4,911
    edited November -1
    I have cured that by changing brands of primers.[:D]
    · Share on FacebookShare on Twitter
  • buckdeerbuckdeer Member Posts: 260 ✭✭✭
    edited November -1
    h414 is temp sensitive in some of my guns you might try h4895
    · Share on FacebookShare on Twitter
  • SilverBoxSilverBox Member Posts: 2,347 ✭
    edited November -1
    I vote for the heat up on the barrel. Try shooting singles and waiting like 15 minutes between each shot to see if its consistant for the first cold shot..
    · Share on FacebookShare on Twitter
  • JustCJustC Member Posts: 16,056 ✭✭✭
    edited November -1
    I know this sounds funny, but a bag of ice draped over the barrel for a minute makes shooting much faster.

    It works[8]

    why chase the game when the bullet can get em from here?....
    Got Balistics?
    · Share on FacebookShare on Twitter
  • I.ShuteI.Shute Member Posts: 647 ✭
    edited November -1
    Randy, don't worry about the spelling, - your keyboard just malfunctioned.
    See? It messed up again on "too".
    Spelled it "to".
    · Share on FacebookShare on Twitter
Sign In or Register to comment.