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Posted: 10/27/2010 3:59:20 PM EDT
Specifically a .223 bullet seater. I guess I didnt realize most dont. News to me!

Came about from this thread
Link Posted: 10/27/2010 4:10:29 PM EDT
[Last Edit: 10/27/2010 4:14:41 PM EDT by AeroE]
Link Posted: 10/27/2010 4:17:13 PM EDT
[Last Edit: 10/27/2010 4:31:47 PM EDT by CLICKBANGBANG]
Originally Posted By Dolomite_Supafly:
Most of the seater dies I have tried don't seat off the tip or off the base of the ogive but somewhere in the middle. Ogive dimensions can vary between bullets in the same box. Some are better than others but all have some sort of variation. This is why I made my seater to seat at .221" of the bullet  ogive to get as close to the bearing surface of the bullet as possible. The factory one was about 1/2 that dimension and because the bullets vary so much this would lead to cartridges not being a uniform distances to the lands after loading.

When I seat bullets using my .221" ID seater I have found substantial variations in catridge OAL when measured from base to tip but when using the .222" Hornady comparator I have catridges that have identical OAL when measuring from base to ogive. If I measure those same catridges from tip to base there will be variations yet all will be the same distance from the lands when loaded in the firearm.

When using a comparator try to get one with a collar as close to the bullet diameter as possible. This will give you better results than one that measures 1/2 way down the ogive. Also, if you have the ability bore your seater rod out to as close to the bullet diameter as possible.

The biggest advantage to using the .221" is no matter how long or short the bullet is comapred to the others the bullet will be seated to the same distance from the lands.


This. A .221 ID ogive seater die. The inside of the RCBS touches very high on the bullet in the pics from the other thread.

EDIT- to add sharpie trick and see where the bullet seater hits. Bullet is a Hornady 68 grain HPBT Match.

Link Posted: 10/27/2010 4:45:26 PM EDT
[Last Edit: 10/27/2010 4:47:28 PM EDT by AeroE]
Link Posted: 10/27/2010 4:49:19 PM EDT

Link Posted: 10/27/2010 4:51:02 PM EDT
Link Posted: 10/27/2010 4:53:29 PM EDT
[Last Edit: 10/27/2010 4:58:04 PM EDT by ziarifleman]

Originally Posted By AeroE:

Just lean on it.  Don't need no extra fancy arbor press!

They work really well when you use a piece of the barrel on your gun and the reamer your chamber was cut with.

Link Posted: 10/27/2010 6:36:05 PM EDT
Link Posted: 10/28/2010 8:58:36 AM EDT
I made a new seated plug for my Lee die. It is .221" and contacts the bullet very close to the bearing surface of the bullet. It let's me seat all my bullets so they are same distance from the lands regardless of bullet length or ogive profile.

The loaded cartridges have varying OAL but when measured using a .222" Hornady tool they all are the same.


Posted Via AR15.Com Mobile
Link Posted: 10/28/2010 9:06:08 AM EDT
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