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jump to lands

 
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  #1  
Old 10-04-2010, 10:06 PM
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jump to lands

I fear I am quickly becoming the annoying rookie who asks too many questions. I appreciate all of the replies I have recieved so far. I took some previous advice and bought a hornaday oal gauge and bullet comparator. I loaded a bullet that would just fit into my magazine and compared its length to the max oal I got from the gauge. I found that the the longest bullet I can fit in the magazine is about .050 from the lands. In the manual that came with the oal gauge it recommended .04 to .02 jump for better accuracy. I am thinking about loading some bullets that are too long for the magazine just to shoot at the range to see if they are acutally more accurate.
I don't have a super fancy custom gun, but I did do a fair amount of research before buying my tikka. It seemed that most people claimed great accuracy with the gun out of box. I assume that the majority of them were shooting ammo that would fit in the magazine. My question is do most people find a significant increase in accuracy when they seat the bullet closer to the lands? I was also wondering if there are any tikka owners out there and what they have found to be successful. It just seems hard for me to understand why if .04 to .02 or less was the agreed upon rule, a gun maker would limit shooters by making the magazine too small.
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Old 10-04-2010, 10:25 PM
mo mo is offline
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Re: jump to lands

You need to just try them loaded to fit in your box first. You might find you get great accuracy that way. I don't a agree with .04 to .02 statement. I know you don't sort bullets, but if you did you would see not all bullets are the same length, so at .04 to .02 you might have one bullet touching the lands, and another not. Look at the sticky right above your post, it is a great article on Berger bullets, but could relate to just about any bullet. Getting the Best Precision and Accuracy from Berger VLD bullets in Your Rifle
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  #3  
Old 10-04-2010, 11:06 PM
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Re: jump to lands

I'm with mo, seating depth is very seldom the dominant factor in accuracy. I reload for over 40 different rifles and have found accuracy from .160" to .020" off the lands.

If you are really intent on loading close to the lands then you can try different bullets with ogive shapes that will get you closer. Typically a round nose will greatly reduce your jump but we don't want to shoot them because of the low BC. Heavy for caliber TSX's typically can be seated closer. The plastic tipped and long noses on VLD's will set you back on your jump to the lands. IOW if you are looking for terminal performance only then try some Protected Point Partitions and you will be able to seat close or even into the lands.

For me I will start at .030" for normal cup and core bullets and .050" for monometals like TSX, GMX, E-Tips etc. Vary your powder charge, case prep, primer selection etc and you can find accuracy at almost whatever seating depth you choose. There are many rifles that shoot factory ammo in rifles like Weatherby's and Ultra Mags that have huge jumps and still manage to shoot 1/2 MOA or smaller.
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Old 10-05-2010, 06:45 AM
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Re: jump to lands

Best accuracy load for my old Tikka T3 varmint 308 was a 2.80 COAL 175 SMK fed match primers with 41.5gr Varget. 10 shot group of 3/4"--one ragged hole. This is 0.07 from the lands in my HOWA 308...I don't know how far from the lands in the Tikka, but I didn't worry because the Tikka didn't have room for a longer round.

My Howa should allow me to get closer to the lands than the tikka, but I'm not there yet..still trying to find the optimal charge weight first...

Didn't worry about jump but it barely fit in the plastic mag.
Matt
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Last edited by zupatun; 10-05-2010 at 11:21 AM.
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  #5  
Old 10-05-2010, 02:47 PM
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Re: jump to lands

What they said!!! Bullet jump is all over the place. Benchresters usually seat into the rifling, not just on it. But Weatherby boomers have around .250" freebore, yeah, about 1/4". Iv'e seen two .30 x .378 customs (with factory dimension chambers) shoot 5 shots under 1/4 moa, so freebore sure didn't hurt them.

Couple of things to remember. One, as you approach the rifling, at some point the same load will start to increase in pressure, and two, some bullets like being into the rifling, and some don't.

If your rifle is for hunting, you want ammo that will go in the magazine. Start there, and only go to single loaded ammo as a last resort. If you have a good rifle, you will find that it will shoot something that will fit in the magazine.

Good luck and good hunting, Tom
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  #6  
Old 10-05-2010, 10:31 PM
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Re: jump to lands

I am going though the same thing with my 700 .06 I just pick up one of them RCBS precision mic's. Just got back from the range didnt work to well. I started at .010 jump thinking about .015. What do you all think.
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  #7  
Old 10-06-2010, 06:30 AM
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Re: jump to lands

Quote:
Originally Posted by woods View Post
I'm with mo, seating depth is very seldom the dominant factor in accuracy.
In contrast, I cannot think of any single thing that has a larger affect on accuracy than seating depth. Maybe this thinking applies out there at 1moa+, but you can't just pick any old seating depth and work your way below 1/2moa. You'll need to identify the BEST seating for your bullets/barrel.
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