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Seat into the lands or "jump"?

 
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  #1  
Old 06-23-2008, 09:34 PM
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Location: Sask, Canada
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Seat into the lands or "jump"?

Hey Guys,

I am starting to play around with seating depths in most of my rifles. The question is, which shoots better: seating into the lands by say 0.005" or "jumping" the bullet to the lands?

If seating into the lands, typically how far should one be going? If "jumping", once again, about how far should one be going? I am looking for what gives the best accuracy. Thanks for the help!
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  #2  
Old 06-24-2008, 06:30 PM
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Join Date: Mar 2008
Location: Alabama
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Quote:
Originally Posted by Alucard View Post
Hey Guys,

I am starting to play around with seating depths in most of my rifles. The question is, which shoots better: seating into the lands by say 0.005" or "jumping" the bullet to the lands?

If seating into the lands, typically how far should one be going? If "jumping", once again, about how far should one be going? I am looking for what gives the best accuracy. Thanks for the help!
Lots of schools of thought here. Mine is if the magazine allows it, I seat in to the lands. Just touching. I figure if it wont shoot that way, I can't figure how it will not touching, but I know a lot of guys that develope their loads playing with seating depth too. No wrong way, and ultimately, your gun, and only your gun will tell you the answer for you and your gun.
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  #3  
Old 06-24-2008, 07:11 PM
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Join Date: May 2001
Location: West Des Moines, Iowa
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I usually seat at .010 off. I noticed a thread on another board about a shooter having great luck in accuracy with a 100 g hornady bullet in a 7mm mag. I tried it in my Ruger 77. Using the formula that the bullet must be seated a min of its diameter, this load worked out to .26+inches in jump. 5 shot groups were less than 1". I would say it depends on??? That is a way better group than I get with any loads off the bench with this rifle.
Jim
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  #4  
Old 06-25-2008, 05:01 AM
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Join Date: Jan 2007
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It really boils down to what your rifle likes. Some shoot best with 5-10 thou jump. Others with that much or more jam. You need to experiment. Seat .005 difference at a time. In general, VLD's shoot better with jam. I shoot 80 gr. Berger VLD's in my competition .223 and it likes .020 jam.
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  #5  
Old 06-25-2008, 05:14 AM
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Originally Posted by Gene View Post
It really boils down to what your rifle likes. Some shoot best with 5-10 thou jump. Others with that much or more jam. You need to experiment. Seat .005 difference at a time. In general, VLD's shoot better with jam. I shoot 80 gr. Berger VLD's in my competition .223 and it likes .020 jam.
I'm with Gene on the first part.

Can't say about VLD's - yet.

My .308 Remington can be seated out to 2.942", forget about using the mag.

I tried everything but load to 2.80" OAL because the best accuracy came from that and 0.020" off the lands.
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  #6  
Old 06-25-2008, 10:41 PM
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Originally Posted by Gene View Post
It really boils down to what your rifle likes. Some shoot best with 5-10 thou jump. Others with that much or more jam. You need to experiment. Seat .005 difference at a time. In general, VLD's shoot better with jam. I shoot 80 gr. Berger VLD's in my competition .223 and it likes .020 jam.
YOu can tune your gun to shoot with a little jump. It sure makes it easier to finesse into the magazine and to get loaded rounds out. All mine jump. I quit shoot in the lands when I had one come apart on an expensive hunt.

Got them all tuned with at least .020 jump and some as much as .060. They all will shoot bug holes as well.

James
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  #7  
Old 06-26-2008, 01:55 PM
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Join Date: May 2004
Location: North Louisiana
Posts: 218
It depends...

It depends on the rifle. I've loaded for several that it just didn't matter. For hunting ammo, I like them just off the lands to keep from having any mishaps in the field. The mag length kills many hunting rifles. One reason I prefer 700 LAs.

If you are just punching paper try several and see what proves best, but for your hunting rigs, you may want to have alittle "jump."

Good Luck

Reloader
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