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Reloading Berger Bullets


Measuring lands help needed

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Unread 07-27-2010, 10:12 AM
Bronze Member
Join Date: Jan 2010
Posts: 68
Measuring lands help needed

I have a new 7mm Rem Mag ( Vanguard sub-moa ) and need some help measuring to the lands. Do you guys use the wooden dowel method? Split case method? Or do i just keep adjusting the 168 berger until I start to see rifling marks on the ogive? Please help. Does anyone have any pictures of your bullet touching the lands?
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Unread 07-27-2010, 10:25 AM
Silver Member
Join Date: Nov 2008
Location: Federal Way, WA
Posts: 204
Re: Measuring lands help needed

I use a hack saw or dremel wheel to make 4 cuts down the case neck to just above the shoulder junction. I file the cuts smooth inside and out then lube and size it just to make sure it doesn't bind up. You should be able to slide a bullet into the neck so it rests in there. Next, I cover the bullet with sharpie, rest it in the case and chamber it. If the bolt won't close (shouldn't take more force than normal for chambering a round), I take the case out and cut a little deeper in the neck toward the shoulder, file and size and try again.

If you get a bullet stuck in the lands, a couple sharp raps of the butt on the floor should jar it loose.

Once the case is where it needs to be, I mark up the bullet with sharpie, chamber and carefully extract. If it works right, you should be able to see rifling marks on the ogive of the bullet. There will also be marks on the flat of the bullet from the case. If you can see these when the case is extracted, the bullet has shifted during extraction and the process needs to be repeated.

I do 5 or 6 measurements just to verify that I've done it right.

Good luck!
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Unread 07-27-2010, 10:32 AM
Silver Member
Join Date: Apr 2008
Location: Philadelphia Pa.
Posts: 403
Re: Measuring lands help needed

OR use one of the many tools sold for doing this measurement too many to list
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Unread 07-27-2010, 01:14 PM
Gold Member
Join Date: Sep 2009
Location: La Plata NM
Posts: 639
Re: Measuring lands help needed

Here is what you will need to make it simple. Make sure your comparator matches your caliber or calibers. They make two.

HORNADY : Hornady Lock-N-Load OAL Gauge (standard) (CFG-2000 ) -_

SINCLAIR INTERNATIONAL : Sinclair Bullet Comparator #1 (09-600 ) -


Last edited by coyotezapper; 07-27-2010 at 01:16 PM. Reason: Added one more link
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Unread 08-02-2010, 08:37 PM
Platinum Member
Join Date: Feb 2009
Posts: 3,548
Re: Measuring lands help needed

406pat, good tip, thanks for sharing.

Last edited by Chas1; 08-03-2010 at 11:19 AM.
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Unread 08-02-2010, 08:48 PM
Junior Member
Join Date: Nov 2009
Posts: 21
Re: Measuring lands help needed

I take one of my fired cases and seat the bullet longer than I know will be acceptable then I chamber it slowly. The bullet slides back under the pressure. My fired cases have enough neck tension to hold a bullet tight enough to do this. If they didn't, I would slightly neck size the case. I usually pull the bullet after I measure it and do this a good three times or so to make sure I have a good max OAL. This only works for the specific bullet that I have seated (do not measure one and then try to load another). It may not be the best way but, it has worked really well for me and I don't have to buy anything.
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Unread 08-03-2010, 12:13 AM
Platinum Member
Join Date: Oct 2009
Location: Thunder Basin, WY
Posts: 1,788
Re: Measuring lands help needed

There are a few tools that you can use to do this, that have been mentioned.

I don't think anyone has mentioned the RCBS Precision Mic.

They make it in alot of standard factory chamberings. I've used them for alot of years on the guns that have factory chambers. Wildcats require one of the other tools mentioned here.....I use the Sinclair for those guns.

One big plus for the Precision Mic is that it's a three purpose tool. It can also be used to measure headspace and set up your FL sizing die to only size a minimal amount of the brass (minimized run out, work hardening and case head separation).

I highly recommend them for factory chambered rifles.
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