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Author Topic: Bullet jump  (Read 794 times)

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Offline RWK

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Bullet jump
« on: January 02, 2012, 09:27:41 AM »
How much, is too much bullet jump.
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Offline Brithunter

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Re: Bullet jump
« Reply #1 on: January 03, 2012, 02:29:19 PM »
Too much is when the bullet won't stay in the neck and falls into the case.


  Now really bullet jump to the leade is one of the most B/S'd thing I hear. You see and hear folks say about 0.005" or 0.025" off yet in my experience the best grouping achieved in several of my rifles have a big jump like the 120 grain Speer bullet in the Sporterised Swedish Mauser with it's military barrel. Or the Hornady 130 Grain SP in the 30-30 throated fro Winchester 170 grain flat nosed bullets.

    The 139 Grain BTSP in my 7x57 would not group under about 1 1/2" until I seated the bullets to the canulure on the bullet then worked it out about 0.050" out of the case mouth so the crimp ring is loaded about 0.050" in font of the case mouth then it groups about 5/8".

  After finding this I pretty much gave the must be close to the leade/throat mantra the label of B/S.
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Offline SteveHawaii

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Re: Bullet jump
« Reply #2 on: January 03, 2012, 03:20:51 PM »
I have a Rossi single shot in .243 that came from the factory with a 1/4" (.250) freebore!  I guess something longer than that.
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Offline Hooker

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Re: Bullet jump
« Reply #3 on: January 03, 2012, 03:47:16 PM »
Without testing what ones rifle and cartridge combination prefers one can only guess how much is to much or not enough jump.
There is no written in stone measurement that works for all.

Pat
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Offline trotterlg

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Re: Bullet jump
« Reply #4 on: January 03, 2012, 03:50:06 PM »
There just isn't really an answer, just depends on what your barrel likes and what you can seat them too.  If you cannot touch the lands, and you probably can't if you have a factory barrel, then try more and then less, you will definately find a place that the gun shoots best, and it may not be the shortest jump you can get.  Larry
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