close
Long Range Hunting Online Magazine


Go Back   Long Range Hunting Online Magazine > Hunting > Long Range Hunting & Shooting

Long Range Hunting & Shooting Nightforce Optics

Reply

Bullet into lands= velocity deviation?

LinkBack Thread Tools Display Modes
  #1  
Unread 11-14-2011, 11:04 AM
Silver Member
 
Join Date: Dec 2010
Location: Booneville, Ar
Posts: 290
Bullet into lands= velocity deviation?

Loading bergers into lands(not intintional, just working up load) Can this cause large velocity diffrences? Bullets all loaded the same with H4831 can show as much as 30 to 60fps diffrence depending on grains of powder used with the heavier powder loads providing the larger diffrences. Could the bullet being jamed into the lands cause this? Thank's, Brad

Last edited by RangerBrad; 11-14-2011 at 11:15 AM.
Reply With Quote
  •   #2  
    Unread 11-14-2011, 11:09 AM
    Platinum Member
     
    Join Date: Nov 2008
    Location: Central Pennsylvania
    Posts: 4,155
    Re: Bullet into lands= velocity deviation?

    Not necessarily. I would think it would have more to do with powder volume and primer. Not to mention if you are using virgin brass. I know that with virgin brass I get higher ES's than if I have just neck sized brass already formed to my chamber. Your seating depth will also adjust your ES. But the trade off is finding good accuracy.

    Tank
    __________________
    Matthew 7:13-14
    "Enter through the narrow gate. For wide is the gate and broad is the road that leads to destruction, and many enter through it. [14] But small is the gate and narrow the road that leads to life, and only a few find it.

    If you find your self in a fair fight, your tactics suck!- Marine 1st Sergeant Jim Ryfinger

    Friends don't let friends develop canonitis!-chucknbach

    arguing over the internet is like the special Olympics....even if you win, you are still...special!
    Reply With Quote

      #3  
    Unread 11-15-2011, 05:30 PM
    Silver Member
     
    Join Date: Dec 2010
    Location: Booneville, Ar
    Posts: 290
    Re: Bullet into lands= velocity deviation?

    I am using all Winchester brass fired from my rifle, am very particular about measured amount of powder and Remmington 9 1/2 primers. Not doing anything special just resize, trim, deburr, clean primer hole, reprime, measure and add powder and seat 115gr Berger bullet. I am extremely new to reloading but, can't figure out what I must be doing wrong. Measurments are from a Competition Electronics Prochrono Chronograph. Have gone to the range several diffrent days and used several diffrent loads but always with the same problem. Any ideas? Thank's, Brad
    Reply With Quote
      #4  
    Unread 11-15-2011, 08:54 PM
    Official LRH Sponsor
     
    Join Date: Feb 2011
    Location: N. Texas and S. Africa
    Posts: 7,706
    Re: Bullet into lands= velocity deviation?

    Quote:
    Originally Posted by RangerBrad View Post
    Loading bergers into lands(not intintional, just working up load) Can this cause large velocity diffrences? Bullets all loaded the same with H4831 can show as much as 30 to 60fps diffrence depending on grains of powder used with the heavier powder loads providing the larger diffrences. Could the bullet being jamed into the lands cause this? Thank's, Brad
    Yep. Jamming it into the lans increases chamber pressure because less gas escapes around and then ahead of the bullet the bullet during ignition.
    __________________
    Without the First and Second Amendments the rest of The Constitution is Meaningless.

    Last edited by WildRose; 11-16-2011 at 03:13 AM.
    Reply With Quote
      #5  
    Unread 11-16-2011, 11:07 PM
    Platinum Member
     
    Join Date: Jan 2011
    Posts: 2,206
    Re: Bullet into lands= velocity deviation?

    Seating bullets in the lands doesn't hurt a thing, I bet your not sorting the bergers by ogive length and your not using a comperator to check the seating depth, if you have one .010" in the lands, another .015" in and another .007" in then yes it will effect ES and SD. Try your combo with 115 noslers by jumping them and see if it brings the spread down if so that's probably your issue, bergers can be easy and they can be a pain in the *****!
    Reply With Quote
      #6  
    Unread 11-17-2011, 02:13 AM
    Official LRH Sponsor
     
    Join Date: Feb 2011
    Location: N. Texas and S. Africa
    Posts: 7,706
    Re: Bullet into lands= velocity deviation?

    Quote:
    Originally Posted by RangerBrad View Post
    Loading bergers into lands(not intintional, just working up load) Can this cause large velocity diffrences? Bullets all loaded the same with H4831 can show as much as 30 to 60fps diffrence depending on grains of powder used with the heavier powder loads providing the larger diffrences. Could the bullet being jamed into the lands cause this? Thank's, Brad
    Are you getting the greater variation with the heavier charge?

    If so try backing off a bit.

    Are you seeing any pressure signs on your brass?
    __________________
    Without the First and Second Amendments the rest of The Constitution is Meaningless.
    Reply With Quote
      #7  
    Unread 11-17-2011, 08:02 AM
    Platinum Member
     
    Join Date: Nov 2008
    Posts: 1,087
    Re: Bullet into lands= velocity deviation?

    Depends on powder.
    With Retumbo (AR2225) I get great results by jaming the 300gn Berger 0.015" into the lands to reduce ES and long range vertical.
    Jaming assists uniform ignition with this slow powder.
    Reply With Quote
    Reply

    Bookmarks

    Thread Tools
    Display Modes


    Similar Threads for: Bullet into lands= velocity deviation?
    Thread Thread Starter Forum Replies Last Post
    Help with 300 RUM velocity standard deviation Shooter Fred Reloading 2 08-12-2011 12:39 PM
    Velocity deviation question for 700yd gun mcseal2 Long Range Hunting & Shooting 9 08-11-2010 08:37 PM
    Measuring Bullet Seating off the Lands ntrl_brn_rebel Reloading 17 06-30-2010 11:36 PM
    Muzzle velocity Deviation daveyj Reloading 3 12-14-2009 01:16 PM
    testing how far bullet is off the lands? diderr Reloading 8 03-27-2008 04:58 PM


    All times are GMT -5. The time now is 09:24 PM.


    Powered by vBulletin ©2000 - 2017, Jelsoft Enterprises Ltd.
    Content Management Powered by vBadvanced CMPS
    All content ©2010-2015 Long Range Hunting, LLC