Long Range Hunting Online Magazine


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

Reloading Techniques For Reloading


Reply

bullet seating depth

 
LinkBack Thread Tools Display Modes
  #1  
Old 06-04-2010, 08:52 PM
Silver Member
 
Join Date: May 2010
Location: New Zealand
Posts: 198
bullet seating depth

so i see alot ppl talking bout seating the bullet .x" away frm the lands. how do you go about getting that number and measuring it against the round


thanks

lucas


-------------------------------------------
what ya going to shoot with that? ya no those deer that are just to far for you well there not for me
Reply With Quote
  #2  
Old 06-05-2010, 10:12 AM
Gold Member
 
Join Date: Jun 2006
Location: Shangri-La
Posts: 930
Re: bullet seating depth

Hey jimbo

There are several methods, some require you purchase a tool and some you can use what you have on hand. Briefly

Hornady Lock-N-Load Overall Length Gage Bolt Action - MidwayUSA (you will need a modified case also in your caliber)

SINCLAIR INTERNATIONAL : Sinclair Seating Depth Gauge - (does not work in all rifles and harder to do)

Cleaning rod method - file a cleaning jag tip smooth, put it on the cleaning rod and insert down the muzzle to the bolt face. Mark it with a piece of tape at the muzzle. Remove the bolt and insert a bullet down to the lands and hold it there with a pencil or wooden dowel. Insert the rod down to the bullet tip and again mark the muzzle on another piece of tape. Measure between the marks.

Split case or bent case neck method - Either split a case with a dremel tool or squash it a little so that it will hold a bullet fairly firm but the bullet can move. Insert a bullet and chamber it and the chamber will seat the bullet into the neck. Carefully remove it and measure. You have to be carefull that the lands do not grab the bullet and pull it partway back out. Do it several times and you can even blacken the bullet so you can see where the neck scrapes if the bullet is being pulled partially back out.



Main thing is not to try to get too close to the lands because there are a lot of variables: bullet ogives different, modified case headspace, seating dies, press linkage compressions, bullet grip variances, etc. etc. etc. So stay .025" off + and you will be fine. IMO .025" off the lands is preferable to the .250" off the lands which is what many manual OAL recommendations will give you.

That should get you started.

The method I use is an R-P tool that I bought 4 or 5 years ago for $25.00. You can e-mail the entrepreneur who sells them at r_reeves61@bellsouth.net. His name is Randy and he works offshore in Louisiana so he is probably very busy or not working at all because of the oil spill, but he is a great guy and will send you one and you can send him the money if you like it. I paid for mine cause it is the best $25.00 I ever spent.

It is a stainless rod with 2 lockable collets and it works like the cleaning rod method described above except it gives you much more accurate measurements






I guess it wasn't so brief afterall!
__________________
If you can read this, thank a teacher.......if you are reading this in English, thank a soldier.
Reply With Quote
  #3  
Old 06-24-2010, 01:35 AM
Silver Member
 
Join Date: May 2010
Location: New Zealand
Posts: 198
Re: bullet seating depth

awesome might drap the laptop dwn tothe garage and gohave a play
__________________
what ya gonna shoot with that. ya know those deer that are just outta range for you. yeah. well there not 4 me!
Reply With Quote
  #4  
Old 06-24-2010, 06:52 AM
Platinum Member
 
Join Date: Oct 2007
Location: Mountians of SW NC, near Asheville
Posts: 1,596
Re: bullet seating depth

"so i see alot ppl talking bout seating the bullet .x" away frm the lands."

Jim, first, Woods give you excellant info in how to find MAX length when seating to the lands. After that, all bets are off.

Anyone telling someone else how far off the lands they should be seating will likely lie about other stuff too.
Reply With Quote
  #5  
Old 06-24-2010, 10:07 AM
Platinum Member
 
Join Date: Jun 2007
Location: Wilmington NC
Posts: 4,172
Re: bullet seating depth

First off, IF it is a magazine gun you are limited to max COAL that will fit in the mag.

So no point in even figuring where the lands are!!

Start at that point and work back to see where the gun likes them.

Single shots, work with a variety of techniques listed. you can also read on www.sinclairintl.com on their forum (Reloading Press), left hand side of the home page, how and the discussion of the tools they sell and how to use them.

BH
Reply With Quote
  #6  
Old 06-24-2010, 01:38 PM
Silver Member
 
Join Date: May 2010
Location: New Zealand
Posts: 198
Re: bullet seating depth

i realise that woods cnt tell me to seat my amax x off the lands because every rifle is different but what woods has done is given me a point to where i can seat out to so i dnt make 50 rounds take them to the range and find out there all **** cause there to long

yes i can only go as lng as the mag but i have been told that the dne thing is to get a single shot non mag fit right then have a back up mag fitted round in the mag if need be.

lucas
__________________
what ya gonna shoot with that. ya know those deer that are just outta range for you. yeah. well there not 4 me!
Reply With Quote
  #7  
Old 08-18-2010, 12:31 PM
Silver Member
 
Join Date: Jan 2005
Location: Northern Virginia
Posts: 307
Re: bullet seating depth

Just to ressurect this thread a little. I need some help and/or advice.

I measured some old factory ammo I have lying around and also pushed some bullets I have (165 Interbond, 165g Scirocco's, and 168g SMK's) into a FL resized piece of winchester brass loaded into my MCR Howa 308. After ejecting the chamberd test piece I measured with my calipers using a stony point bullet comparator (measured at ogive) and also for OAL just using the calipers. Here's what I got:

Round, Comparator Meas. Inches, OAL inches, Note.
Fed Prem. SGK 165gr, 2.125, 2.686, Factory Round.
Win SuperX 150gr, 2.178, 2.708, Factory Round.
Fed Fusion 165, 2.16, 2.718, Factory Round.
Hornady IB 165, 2.253, no meas, As Loaded into Lands.
Swift Scirocco 165gr, 2.221, 2.866, As Loaded into Lands.
SMK 168gr, 2.267, 2.873, As Loaded into Lands.

the average of the factory round measured at ogive on comparator was 2.154
Average for factory OAL was 2.704 (most of these are sp hunting rounds)
I have a couple rounds loaded up for my old Tikka with OAL of 2.802 which was almost max for the tikka Mag...measured at the ogive these are 2.182

For the IB's in the HOWA I slotted the empty case to seat the bullets by chambering the round and measured OAL and with the comparator. The average on hte comparator was 2.247"
The average for these OAL was 2.870

Average differences between factory and hand chambered to lands was .093" delta measured on the ogive and .166" delta for OAL on average...

Question is to what length do I seat these bullets for the OCW test for which I'm reloading, starting with the Interbonds...? It looks as if the factory loads are 0.1" off the lands...

The Howa is an internal drop floor mag so I should have a bunch more room than the Tikka (max was a hair over 2.8" OAL). Where do I start seating? .04" thou off the lands .02" thou, or .01" off or .09" off the lands like the factory loads?

Help or discussions greatly appreciated...

Matt


Quote:
Originally Posted by BountyHunter View Post
First off, IF it is a magazine gun you are limited to max COAL that will fit in the mag.

So no point in even figuring where the lands are!!

Start at that point and work back to see where the gun likes them.

Single shots, work with a variety of techniques listed. you can also read on www.sinclairintl.com on their forum (Reloading Press), left hand side of the home page, how and the discussion of the tools they sell and how to use them.

BH
__________________
Matt Roth
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes


Similar Threads for: bullet seating depth
Thread Thread Starter Forum Replies Last Post
bullet seating depth HOW TO ? haywire05 Reloading 6 07-18-2009 10:56 PM
bullet seating depth for 7mm rem mag DIGGA Rifles, Bullets, Barrels and Ballistics 0 06-09-2009 04:23 AM
Bullet Seating Depth 7mm STW rb85cj7 Reloading 4 04-07-2009 07:59 PM
300 RUM Bullet Seating Depth? MontanaRifleman Reloading 8 02-27-2009 04:09 PM
Bullet Seating Depth BLMalcolm Long Range Hunting & Shooting 2 05-26-2004 01:59 PM


All times are GMT -5. The time now is 10:08 PM.


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