Long Range Hunting Online Magazine


Go Back   Long Range Hunting Online Magazine > Rifles, Reloading, Optics, Equipment > Reloading

Reloading Techniques For Reloading


Reply

Bullet Depth, "off the lands" vrs OAL?

 
LinkBack Thread Tools Display Modes
  #1  
Old 08-06-2011, 11:57 AM
Bronze Member
 
Join Date: Jul 2011
Posts: 43
Bullet Depth, "off the lands" vrs OAL?

I've been setting up to load some shells for my new Savage FVSS 22-250. As I stated in one of my other questions, I'm new to rifle loading but not reloading in gereral.

I've searched for loads for 22-250s similar (same rate of twist and barrel legnth) to mine. One thing I've noticed is some guys post the distance off the lands for their loads. How critical is this compared to the OAL?

I measured the distance to the lands on my rifle. Right or wrong this is the way I did it. I took a once fired brass and had fed it into the resize die until it would hold a bullet very firm but I could still pull it out by hand. Then with the bullet pulled out long I would chamber the mt shell to seat the bullet, then measure it with my digital caliper. The anvil on my mic was to small to measure off the base so I used the caliper. I averaged 10 measurements to get the distance, 2.4630 was the average.

I going to load Varget under Hornady 55gr V-MAX bullets. I measured the factory loaded Hornady 55gr V-Max they averaged 2.3430, .120 off the lands.

Is there an acceptable range? How close is to close or to far?

Thanks, please be patient as I will have other questions I'm sure.
Reply With Quote
  #2  
Old 08-06-2011, 12:24 PM
Platinum Member
 
Join Date: Jan 2008
Location: Northeast
Posts: 2,194
Re: Bullet Depth, "off the lands" vrs OAL?

I think you range is acceptable. I have factory rifles that that are over .150" off the lands and they are very accurate. It seems to depend on the particular bullet barrel combo. If the load is accurate to you standard, it's acceptable. Just make sue that if using a clip, that it will feed. For the real precision stuff I like using distance to the lands as opposed to OAL. It is typical for even some match bullets to be very consistent from the ogive to the lands but have variations in the overall length of the bullet. It seems that it's more difficult for the manufacturers to get the bullet tips consistent. This will give variations in yor distance to the lands. Tools are available that allow you to measure on the ogive for a particular caliber. I use a simple one that is shaped like a hex nut with a variety of holes on each flat to measure the popular calibers. it can be used with a standard caliper and allows me to measure to .001". Hope this helps.
Reply With Quote
  #3  
Old 08-06-2011, 12:32 PM
Bronze Member
 
Join Date: Jul 2011
Posts: 43
Re: Bullet Depth, "off the lands" vrs OAL?

Who makes the tool you use to measure to the ogive?

Thanks
Reply With Quote
  #4  
Old 08-06-2011, 01:25 PM
Platinum Member
 
Join Date: Oct 2007
Location: Mountians of SW NC, near Asheville
Posts: 1,589
Re: Bullet Depth, "off the lands" vrs OAL?

There is no 'rule' for bullet seating and OAL is simply another way of expressing the seating depth. The jump to the lands is what ever we make it.

Contrary to conventional 'wisdom', few factory sporters shoot their best at or really close to the lands. Most do best with a jump from 20 thou off the lands to as much as five times that much. Pick a depth where you want to start develop your charge, then experiment with seating changes in maybe 5 thou steps until you find the best shooting combination for your rig. I like to start maybe 15 thou off but that's just a convient place, others do it differently.

Ogive measurement tools are supplied by Sinclair, RCBS (Precision Case Mic), Innovative Technologies and Hornady.
Reply With Quote
  #5  
Old 08-06-2011, 03:01 PM
Platinum Member
 
Join Date: Aug 2003
Location: NC, oceanfront
Posts: 3,016
Re: Bullet Depth, "off the lands" vrs OAL?

+1 boomtube
And I'll addd that since your are beginning reloading for rifles, you should align your perspectives in this regard.
#1 Don't act on numbers in manuals, but try to understand what they really mean.

If I were you, I'd read a good book about it over a weekend, to head off futility.
This book: "Handloading for Competition: Making the Target Bigger" Book by Glen Zediker - MidwayUSA
Reply With Quote
  #6  
Old 08-06-2011, 03:47 PM
Gold Member
 
Join Date: Sep 2008
Location: Republic of NJ
Posts: 907
Re: Bullet Depth, "off the lands" vrs OAL?

Quote:
Originally Posted by justinp61 View Post
I've been setting up to load some shells for my new Savage FVSS 22-250. As I stated in one of my other questions, I'm new to rifle loading but not reloading in gereral.

I've searched for loads for 22-250s similar (same rate of twist and barrel legnth) to mine. One thing I've noticed is some guys post the distance off the lands for their loads. How critical is this compared to the OAL?

I measured the distance to the lands on my rifle. Right or wrong this is the way I did it. I took a once fired brass and had fed it into the resize die until it would hold a bullet very firm but I could still pull it out by hand. Then with the bullet pulled out long I would chamber the mt shell to seat the bullet, then measure it with my digital caliper. The anvil on my mic was to small to measure off the base so I used the caliper. I averaged 10 measurements to get the distance, 2.4630 was the average.

I going to load Varget under Hornady 55gr V-MAX bullets. I measured the factory loaded Hornady 55gr V-Max they averaged 2.3430, .120 off the lands.

Is there an acceptable range? How close is to close or to far?

Thanks, please be patient as I will have other questions I'm sure.
First of all, oal and the distance to the lands are related, one affects the other. OAL is usually listed as the recommended length to fit in all firearms of that chambering. A load with a short jump to the lands will usually result in a longer than SAAMI spec (manual listing) oal. Most factory rifles seem to like the jump to the lands at about 0.020 - 0.050", in my personal experience. I do have some that are shorter and some that are longer though).

Another side note is that different bullets will have different "jump to the lands" length, due to different ogive shapes.

My findings with the 55 gr. V-Max was about 0.030" jump in my 22-250, but the actual oal for the same jump can differ in each rifle, as it depends on how long the throat of that particular rifle is.

Good luck.
__________________
Red mist. It's an addiction!
http://varmintxt.webs.com/
Reply With Quote
  #7  
Old 08-06-2011, 06:07 PM
Gold Member
 
Join Date: Jan 2008
Posts: 937
Re: Bullet Depth, "off the lands" vrs OAL?

Hornady makes the tool that measures from the Ogive of the bullet to the base of the case. The Ogive is the place on the bullet where it will contact the lands first. The tool is called Hornady Lock-N-Load Bullet Comparator at (Midway midwayusa.com it is product number 709-931). It attaches to a dial calipers. To help you find the measurement of where your particular bullet is hitting the lands in your rifle take a case and full length size it. Then take a cutting tool like a hack saw etc. and cut one side of the neck on the case down to the start of the shoulder. Clean up the burrs. Before every use run it into your size die or just pinch the neck tighter with your fingers. The cut in the side of the neck will allow the neck to flex and allow a bullet to be placed by hand into it and allow you to pull it out after use. As you did before just start the bullet into the case and place in the chamber and close the bolt. Ease the bolt open and carefully remove the case. Carefully measure using the comparator. This is your to the lands measurement to the Ogive of the bullet. Now you can seat deeper etc. and know were your are all the time. If you just measure from the bullet tips as an over all length you will never know exactly how far off the lands you really are. Bullet tips are often NOT the same length but from the base of the bullet to the Ogive it is always the same if the bullets were made on the same machine.
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes


Similar Threads for: Bullet Depth, "off the lands" vrs OAL?
Thread Thread Starter Forum Replies Last Post
"Jamming" bullet into the lands? TnTom Reloading 37 12-12-2010 03:25 PM
What bullet/powder recomendation? 308win, 1in9" twist, 22" barrel Ultra25-06 Long Range Hunting & Shooting 4 11-09-2010 02:51 PM
Article on "Determining Bullet Seating Depth" BountyHunter Reloading 2 04-26-2009 11:08 AM
Seat into the lands or "jump"? Alucard Reloading 8 06-27-2008 02:17 PM
How do you determine "at the lands" by your method? JustC Rifles, Bullets, Barrels and Ballistics 24 05-24-2004 11:45 PM

Current Poll
Do You Think Slingshots Should Be Legalized For Hunting Brown Bear?
Yes - 47.59%
839 Votes
No - 52.41%
924 Votes
Total Votes: 1,763
You may not vote on this poll.

All times are GMT -5. The time now is 02:16 AM.


Powered by vBulletin ©2000 - 2014, Jelsoft Enterprises Ltd.
Content Management Powered by vBadvanced CMPS
All content ©2010-2014 Long Range Hunting, LLC