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Reloading Berger Bullets


Bolt won't close on 300 RUM

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Unread 08-12-2011, 08:15 AM
Junior Member
Join Date: May 2011
Posts: 11
Bolt won't close on 300 RUM

Hey guys, my buddy is helping me develop a load for my 300 RUM. At the range yesterday he had 6 different loads of 210 Bergers. They were loaded with a COAL of 3.680. Quite simply, the bolt would not close with them seated so far out. Factory ammo and some other handloads that were seated deeper had no problem. My question to you is what is the longest COAL you are getting away with. FWIW my gun is a Rem Sendero SFII in 300 RUM and I'm using 210 Bergers and 180/200 Accubonds with Nosler brass. Thanks in advance.
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Unread 08-12-2011, 08:55 AM
Silver Member
Join Date: Jan 2010
Location: So. Utah
Posts: 406
Re: Bolt won't close on 300 RUM

Every gun will be a little different in what the chamber tolerances are. I would consider buying a Hornady COAL guage for your rifle. If you are reloading anyway, then it will be to your benefit to know what the chamber is for your rifle. If you are wanting to know the "safe" COAL. Then SAAMI specs are written in every Reloaoding manual.
If you always do what you've always done, you will always get what you've always got.
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Unread 08-12-2011, 10:06 AM
Platinum Member
Join Date: Nov 2005
Location: Texas
Posts: 1,845
Re: Bolt won't close on 300 RUM

The Truth Is Not Always Good For Business!!

Last edited by Boss Hoss; 11-09-2011 at 06:48 AM.
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Unread 08-12-2011, 02:33 PM
Silver Member
Join Date: Apr 2008
Posts: 190
Re: Bolt won't close on 300 RUM

Did your buddy resize the brass correctly? If so did he measure and trim them to spec? 3.680" COL doesn't sound out the relm for the 300RUM as I'm testing some 200 grain hybrids for Berger in my 300 RUM with a col of 3.729" I suspect it's your brass have your buddy pull a bullet and measure the case I bet they are either too long or not resized correctly? If the bullet was seated too far out when you went to eject the loaded round the bullet would have pulled out of the case did this happen?
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Unread 08-12-2011, 03:31 PM
Silver Member
Join Date: Jun 2008
Location: Texas
Posts: 446
Re: Bolt won't close on 300 RUM

The way I do it is,take a case that has been fired in the rifle,but not resized.Next,mash the end of the neck on a hard surface just enough to give the bullet you will be using,some resistance when you insert the bullet in the neck by hand.You should have a tight fit,but still loose enough that you can push the bullet in by hand with a little resistance.Next,pull the bullet out far enough that you know it's quite a bit longer than it should be if it were a loaded cartridge.Next,open the bolt on your rifle and gently slide the case with the overextended bullet into the chamber and slowly close the bolt.Next,slowly open the bolt and carefully remove the cartridge.Now measure the COL and repeat the steps above several times to make sure you get the same measurement.Now you have the COL for your rifle with the bullet you've chosen to the lands of the rifle.I usually seat in from that COL,around 20-30 thousands and start my load test from there.
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Unread 08-12-2011, 06:32 PM
Gold Member
Join Date: Jul 2009
Location: Idaho
Posts: 581
Re: Bolt won't close on 300 RUM

Is this new brass or fired brass?
How did you come up with that OAL.
I am guessing the shoulder of the brass needs to be bumped a slight bit more
but cant be sure not enough info in you post
I think to safely work up a load you must measure your camber to get a accurate distance to your lands
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Unread 08-12-2011, 06:42 PM
Bronze Member
Join Date: Jun 2011
Location: Fayetteville, Ga
Posts: 52
Re: Bolt won't close on 300 RUM

Will your resized unloaded brass chamber and does your bolt close?
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