Long Range Hunting Online Magazine


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

Reloading Techniques For Reloading


Reply

Help with seating depth

 
LinkBack Thread Tools Display Modes
  #1  
Old 10-15-2012, 07:07 PM
Junior Member
 
Join Date: Aug 2010
Location: Air Force
Posts: 25
Help with seating depth

I bought some 185 Berger HVLDs for my 300 WM this weekend because I've really been wanting to try some out. Its a Rem 700 5r stainless milspec 26" tube. I've been shooting 220SMKs with around .75 moa but I want to try something a little lighter and flatter for hunting. I've read the sticky on seating depths for the vld but I don't have a tool to measure for OAL. I've been loading at 3.340 for everything else and have had good luck. I'm wondering where I should now start as far as COAL for the VLDs. Or should I just wait until I can get my hands on an OAL tool.

I've only been reloading since this summer and I really enjoy it. I started with a 44mag and then my 308 then -06 and now my 300. Any advice will be greatly appreciated.

I've got some RL22 & H1000 and CCI 250s to go with it. Starting load would help too as I don't have a manual for the Berger bullets

Thanks in advance
Tucker
Reply With Quote
  #2  
Old 10-15-2012, 08:52 PM
Bronze Member
 
Join Date: Sep 2012
Posts: 41
Re: Help with seating depth

Pick up a OAL tool. Good luck.
Reply With Quote
  #3  
Old 10-16-2012, 05:14 AM
Silver Member
 
Join Date: Jun 2008
Location: Texas
Posts: 354
Re: Help with seating depth

Tech note from Berger on seating depth
The text below is from the Berger website on how they recommend finding the correct seating depth for their bullets

---------------------------------------------------------
The following has been verified by numerous shooters in many rifles using bullets of different calibers and weights. It is consistent for all VLD bullets. What has been discovered is that VLD bullets shoot best when loaded to a COAL that puts the bullet in a “sweet spot”. This sweet spot is a band .030 to .040 wide and is located anywhere between jamming the bullets into the lands and .150 jump off the lands.

Note: When discussing jam and jump I am referring to the distance from the area of the bearing surface that engages the rifling and the rifling itself. There are many products that allow you to measure these critical dimensions. Some are better than others. I won’t be going into the methods of measuring jam and jump. If you are not familiar with this aspect of reloading it is critically important that you understand this concept before you attempt this test.

Many reloaders feel (and I tend to agree) that meaningful COAL adjustments are .002 to .005. Every once in a while I might adjust the COAL by .010 but this seems like I am moving the bullet the length of a football field. The only way a shooter will be able to benefit from this situation is to let go of this opinion that more than .010 change is too much (me included).

Trying to find the COAL that puts you in the sweet spot by moving .002 to .010 will take so long the barrel may be worn out by the time you sort it out if you don’t give up first. Since the sweet spot is .030 to .040 wide we recommend that you conduct the following test to find your rifles VLD sweet spot.

Load 24 rounds at the following COAL if you are a target competition shooter who does not worry about jamming a bullet:
1. .010 into (touching) the lands (jam) 6 rounds
2. .040 off the lands (jump) 6 rounds
3. .080 off the lands (jump) 6 rounds
4. .120 off the lands (jump) 6 rounds

Load 24 rounds at the following COAL if you are a hunter (pulling a bullet out of the case with your rifling while in the field can be a hunt ending event which must be avoided) or a competition shooter who worries about pulling a bullet during a match:
1. .010 off the lands (jump) 6 rounds
2. .050 off the lands (jump) 6 rounds
3. .090 off the lands (jump) 6 rounds
4. .130 off the lands (jump) 6 rounds

Shoot 2 (separate) 3 shot groups in fair conditions to see how they group. The remarkable reality of this test is that one of these 4 COALs will outperform the other three by a considerable margin. Once you know which one of these 4 COAL shoots best then you can tweak the COAL +/- .002 or .005. Taking the time to set this test up will pay off when you find that your rifle is capable of shooting the VLD bullets very well (even at 100 yards).

Reply With Quote
  #4  
Old 10-17-2012, 04:26 AM
Platinum Member
 
Join Date: Dec 2008
Location: Great Falls, MT
Posts: 4,956
Re: Help with seating depth

Quote:
Originally Posted by XILoveGunsX View Post
Or should I just wait until I can get my hands on an OAL tool.
Yes! There are others but I use Hornady LNL overall length gauge ($30) and modified case ($5, you can also make your own if you have the proper tap/die).

Good luck!
__________________

I voted for my "FREEDOM", "GUNS", and "MONEY" - keep the change - UNK.



"I am always proud of my country!"

"Leadership Rule #2: Don't be an @zzhole." - Maj Gen Burton Field.
Reply With Quote
  #5  
Old 10-17-2012, 07:45 AM
Gold Member
 
Join Date: Dec 2009
Posts: 927
Re: Help with seating depth

You can get by without the OAL gauge or the modified cases. Here's how:

1. Install and close your bolt.

2. Using a jag with the tip ground flat, push a one piece cleaning rod into the muzzle of your rifle until it contacts the bolt face.

3. Mark your cleaning rod at the muzzle (I wrap my cleaning rod in masking tape and score the masking tape with a razor blade held against the muzzle).

4. Using a length of wood dowel, push your chosen bullet into the chamber of your rifle.

5. While holding the dowel/bullet in place, gently push your cleaning rod w/flat tipped jag into the barrel until it stops against the bullet you are holding in the chamber.

6. Mark your cleaning rod again.

7. After removing the bullet from the chamber and the cleaning rod from the barrel, measure the distance between the marks with your reloading caliper.

The resulting measurement will tell you the necessary OAL, measured from cartridge base to bullet tip, to reach the rifling. From there, you can perform the seating depth tests recommended by Berger and described above.
Reply With Quote
  #6  
Old 10-17-2012, 08:52 AM
Silver Member
 
Join Date: Jan 2006
Posts: 158
Re: Help with seating depth

I have had good luck using this method. Load one bullet way to long. Force the round to chamber. Remove the cartridge and measure the obl or oal then seat the bullet .02 to .025 deeper. This should have it just kissing the lans. You then then go out or in to fine tune.
Reply With Quote
  #7  
Old 10-18-2012, 04:58 AM
Platinum Member
 
Join Date: May 2012
Location: N.D.
Posts: 3,164
Re: Help with seating depth

Quote:
Originally Posted by benchracer View Post
You can get by without the OAL gauge or the modified cases. Here's how:

1. Install and close your bolt.

2. Using a jag with the tip ground flat, push a one piece cleaning rod into the muzzle of your rifle until it contacts the bolt face.

3. Mark your cleaning rod at the muzzle (I wrap my cleaning rod in masking tape and score the masking tape with a razor blade held against the muzzle).

4. Using a length of wood dowel, push your chosen bullet into the chamber of your rifle.

5. While holding the dowel/bullet in place, gently push your cleaning rod w/flat tipped jag into the barrel until it stops against the bullet you are holding in the chamber.

6. Mark your cleaning rod again.

7. After removing the bullet from the chamber and the cleaning rod from the barrel, measure the distance between the marks with your reloading caliper.

The resulting measurement will tell you the necessary OAL, measured from cartridge base to bullet tip, to reach the rifling. From there, you can perform the seating depth tests recommended by Berger and described above.
+1

I do similar but use a ss rifle rod and a superfine sharpie for marking. Thanks Benchracer, you saved me some typing.
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes


Similar Threads for: Help with seating depth
Thread Thread Starter Forum Replies Last Post
seating depth changes Robinhood493 Reloading 17 08-17-2012 02:32 PM
Seating depth?? bates132 Reloading 7 11-05-2010 09:27 AM
.243 Seating depth......please help JL523 Reloading 4 09-12-2009 04:15 PM
seating depth strictlyRUM Reloading 4 03-13-2006 05:22 PM
seating depth for 6mm 107 gr MK wannabee Rifles, Bullets, Barrels & Ballistics 1 05-23-2003 06:15 AM


All times are GMT -5. The time now is 06:14 PM.


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