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Bullet Jump

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Unread 01-03-2012, 04:08 PM
rwk rwk is offline
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Join Date: Dec 2007
Posts: 129
Bullet Jump

How far is to farm, on bullet jump in a tight throat.
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Unread 01-04-2012, 10:42 AM
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Join Date: Jul 2004
Location: Texas
Posts: 7,241
Re: Bullet Jump

Originally Posted by rwk View Post
How far is to farm, on bullet jump in a tight throat.

Like everything there is a practical limit and I would say about .250.

I have seen lots of rifles with more than that that shot very well but with more you run
the risk of damaging the bullet from to much speed when striking the lands.

Normally most bullets like .020 or more, unless the rifle is set up to touch the lands and to
deal with more pressure.

Free bore is not an accuracy issue as long as you have a good chamber and good reloading

The advantage of free bore is the more you have the less pressure you generally have with
the same powder charge helping to utilizes longer barrels.

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Unread 01-06-2012, 07:14 PM
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Join Date: May 2011
Posts: 68
Re: Bullet Jump

As you get closer to the lands, you build more pressure and have more heat.

As you get further away from the lands, you build less pressure/heat. BUT you have the harsh impact of the bullet as it is going much faster when it makes contact. There is a compromise, but I can't say where it is. I would start with .04 personally.
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Unread 01-07-2012, 12:08 AM
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Join Date: Mar 2011
Location: Brusly, LA
Posts: 162
Re: Bullet Jump

Start with a touch (if possible), watch your work-up, then back off as needed. Just gotta see what a particular rifle and bullet like.
To teach those that don't know, To remind those that do Know, To correct those that think they know.
-Helio Gracie
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Unread 01-07-2012, 11:10 AM
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Join Date: Mar 2010
Location: on the Southern Plains
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Re: Bullet Jump

Berger Bullets Blog. Pertinent info at bottom of the page; http:/02b0516.netsolhost.com/blog1/?cat=8
"Shoots real good!": definition; it didn't blow-up in my face. 1993 graduate Montgomery Community College 2yr. gunsmithing program

Last edited by shortgrass; 01-07-2012 at 01:08 PM.
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Unread 01-07-2012, 12:22 PM
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Join Date: Jan 2008
Location: Northeast
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Re: Bullet Jump

In my tight throat rifles I have used from .010 to .075. I have two 6.5x284's that have produced the best accuracy results in the .070-.075 range using 140 Berger Hunting VLD's. I used the method described on the Berger site and it worked well. Prior to that I was seating fairly tight(less than .025) and experiencing higher pressures and larger groups.

"Let us speak courteously, deal fairly, and keep ourselves armed and ready"-T. Roosevelt
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