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bullet to lands, max distance?

 
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  #1  
Old 09-24-2012, 08:16 AM
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Join Date: Sep 2012
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bullet to lands, max distance?

Hi,
I have an older Remington 700 BDL, 30-06. Bought it used. It, shoots 2" or less groups at 100yrds. I want better accuracy for long range hunting, 600-800 yards.

I'm in the process of measuring the chamber for reloading. I diassembled a Remington core Loct 180gr factory round and slid the bullet just into the case end, chambered the round and gentle ejected. I was surprised to discover a 0.170" distance between the rifling lands and the seating grove on the bullet.

I repeated the measurement test with Hornaday measuring equipment, Berger and Sierra bullets. The bullets barly slid into the case, about .050". Not enough to create a safe reload.

Has anyone seen such a gap between bullet and rifling lands? What should I do?
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  #2  
Old 09-24-2012, 08:26 AM
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Re: bullet to lands, max distance?

Welcome to LRH and enjoy!

Check out the similar/related threads below.
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  #3  
Old 09-24-2012, 08:52 AM
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Location: Cincinnati, Ohio
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Re: bullet to lands, max distance?

Quote:
Originally Posted by tstarky View Post
Hi,
I have an older Remington 700 BDL, 30-06. Bought it used. It, shoots 2" or less groups at 100yrds. I want better accuracy for long range hunting, 600-800 yards.

I'm in the process of measuring the chamber for reloading. I diassembled a Remington core Loct 180gr factory round and slid the bullet just into the case end, chambered the round and gentle ejected. I was surprised to discover a 0.170" distance between the rifling lands and the seating grove on the bullet.

I repeated the measurement test with Hornaday measuring equipment, Berger and Sierra bullets. The bullets barly slid into the case, about .050". Not enough to create a safe reload.

Has anyone seen such a gap between bullet and rifling lands? What should I do?

My Rem 22-250. My reloads are seated more than .125 further out that factory and can go even more...but wont feed from the magazine if I go more
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  #4  
Old 09-24-2012, 09:33 AM
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Join Date: Sep 2012
Posts: 21
Re: bullet to lands, max distance?

Thanks Feenix. The largest gap reported there was .040 none addressed a 4 times+ larger gap of .170. Has anyone measured their Remington 700? What distance have you found? I'm wondering if this is factory or worn or miscut by a gunsmith.
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  #5  
Old 09-24-2012, 10:47 AM
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Join Date: Apr 2012
Location: The cold part of Montana
Posts: 1,390
Re: bullet to lands, max distance?

I'm jumping mine 0.080" any less than 0.060 jump and I can't use my magazine
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Keep in mind the animals we shoot for food and display are not bullet proof. Contrary to popular belief, they bleed and die just like they did a hundred years ago. Being competent with a given rifle is far more important than impressive ballistics and poor shootability. High velocity misses never put a steak in the freezer.

Joe
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  #6  
Old 09-25-2012, 05:55 AM
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Join Date: Dec 2005
Location: Tucson Az
Posts: 1,095
Re: bullet to lands, max distance?

The best you can do is to seat the bullet deep enough in the neck so it don't move during recoil in the mag box. Work up a load and ignore the jump. Heck Weatherby used to have a .375" jump and they shot just fine.

If it really bothers you, have the barrel setback and rechambered. Even better, get a new barrel and have it chambered to suit you.

I just got through loading a friend's sporter 300 WSM. Due to short magazine OAL is 2.850. Jump to rifling is .140", it shoots just fine.
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  #7  
Old 09-25-2012, 07:21 AM
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Join Date: Sep 2012
Posts: 21
Re: bullet to lands, max distance?

Thanks everyone.
Having heard that there are rifles out there that shoot fine with a large jump to lands helps build my confidence in this rifles possibility to hold smaller groups by creating custom rounds.

I spoke to Bruno's here in Phoenix AZ and he suggested that if I wanted a new custom barrel it would cost $900 because he would not place a new barrel without truing the action first. Sage advice. I was not ready to spend $900 on this 30-06 rifle today. I will do this on another more match favorable caliber rifle.
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