The Firing Line Forums

Go Back   The Firing Line Forums > The Skunkworks > Handloading, Reloading, and Bullet Casting

Thread Tools Search this Thread
Old April 2, 2019, 05:02 AM   #1
Senior Member
Join Date: April 5, 2015
Posts: 159
Bullet Seating Depth

When shooting a 22-250 at 100 yards how many 1000ths variation on seating depth will start to make a difference in accuracy? Thanks for the help.
Poconolg is offline  
Old April 2, 2019, 05:10 AM   #2
Senior Member
Join Date: April 12, 2009
Posts: 363
It will vary with different bullets. I've see it with .005 in seating depth. With my 22-250.
sako2 is offline  
Old April 2, 2019, 08:01 AM   #3
Senior Member
Join Date: September 2, 2010
Location: Plainview , Long Island NY
Posts: 3,675
I would agree with Sako2 ,..005 is pretty small when looking at it but is enough to see a change . That said your case sizing also has a important part to the round . That's why I switched from neck to full sizing for benchrest shooting . I want to start out with my cases as close to exact as possible . If there's different wiggle room in your cases jumping or jamming is out the window . Neck sizing the OD may be good but the lengths aren't the same .
cw308 is offline  
Old April 2, 2019, 08:52 AM   #4
Senior Member
Join Date: February 21, 2011
Location: way out here
Posts: 211
Pick a seating depth of .020" off the lands, and make up loads longer and shorter, in .010" steps. Assuming your rifle is capable of delivering needed accuracy, you should see the groups go through a valley when you hit a 'sweet' spot. And even .010" steps may be too much, but generally has worked for me. If this doesn't show results, there is a good chance that other factors are influencing your groups, like poor bedding, on and on. Some barrels don't like some bullets too, so that is another thing to look at. As CW308 mentions, case prep is critical. You need to eliminate as many variables as possible, so when you change one thing, you can be fairly confidant that changes you see can be attributed to that change.
zplinker is offline  
Old April 2, 2019, 11:13 AM   #5
Senior Member
Join Date: April 10, 2008
Location: Alaska
Posts: 6,237
I do .010 steps as the bullet variation even on Ogive is .005.

Sometimes I find one that is really more like .008-.010

Reality if you you do .010 your are only .005 off the mean.
Science and Facts are True whether you believe it or not
RC20 is offline  
Old April 3, 2019, 05:50 PM   #6
Senior Member
Join Date: June 9, 2010
Location: NEPA
Posts: 893
Take a look at your bullets and measure them from base to tip. Lead points may be off 0.01.
PA-Joe is offline  
Old April 3, 2019, 06:26 PM   #7
Senior Member
Join Date: June 15, 2008
Location: Georgia
Posts: 9,836
I always start with the bullets as long as possible that will still fit in the magazine and chamber in the rifle. That way instead of trying to experiment with longer and shorter OAL you only have one direction to go. You can't make them any longer. And most of the time that is where I find best accuracy.
"If you're still doing things the same way you were doing them 10 years ago, you're doing it wrong"

Winston Churchill
jmr40 is offline  

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

All times are GMT -5. The time now is 03:35 PM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
This site and contents, including all posts, Copyright © 1998-2018 S.W.A.T. Magazine
Copyright Complaints: Please direct DMCA Takedown Notices to the registered agent:
Contact Us
Page generated in 0.04784 seconds with 8 queries