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How do I find the lands?

 
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  #1  
Old 08-17-2011, 11:14 PM
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Join Date: Dec 2009
Posts: 107
How do I find the lands?

I am getting ready to sight in my 280 AI and was wondering how I can find out EXACTLY when the bullet touches the lands?
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  #2  
Old 08-18-2011, 01:02 AM
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Join Date: Nov 2010
Posts: 17
Re: How do I find the lands?

Find a rod just slightly smaller than your barrel ( not steel) aluminum or brass.
Make sure rod is long enough to reach chamber. You will also need a wooden dowel 18" long. Drop bullet in chamber so it goes to lands, slide rod into muzzle of barrel so it contacts tip of bullet, with a fine point marker mark rod right at muzzle. Remove bullet insert bolt & close, with rod against bolt face make another mark on rod at the muzzle, measure between these 2 marks that should put you close. Oh the dowel is to hold the bullet in the lands.
Brubo
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  #3  
Old 08-18-2011, 01:17 AM
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Join Date: Aug 2011
Location: Sioux Lookout, Ontario
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Re: How do I find the lands?

What I do is cut a slit in the neck of a empty case and insert a bullet so it's seated extra long. Thrn chamber the round and close the bolt. Carefully extract the case, making sure the bullet dosen't drag along the side of the chamber. Measure the case afterwards. Do this at least 10 times to get an average. You will start to see consistant numbers, disregard numbers that are way out to lunch, either the bullet was pulled out some when extracting it or what not. Works for me. I don't know if this is accurate enough for you, just throwing it out there. Do this for each bullet type you intend to shoot to find the distance to the lands for each type.
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Old 08-18-2011, 09:43 AM
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Location: Wilmington NC
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Re: How do I find the lands?

Quote:
Originally Posted by 80Maro View Post
What I do is cut a slit in the neck of a empty case and insert a bullet so it's seated extra long. Thrn chamber the round and close the bolt. Carefully extract the case, making sure the bullet dosen't drag along the side of the chamber. Measure the case afterwards. Do this at least 10 times to get an average. You will start to see consistant numbers, disregard numbers that are way out to lunch, either the bullet was pulled out some when extracting it or what not. Works for me. I don't know if this is accurate enough for you, just throwing it out there. Do this for each bullet type you intend to shoot to find the distance to the lands for each type.
this works but two significant issues here the way it was explained.

1. this method does not measure where it touches. it measures the "jam" into the lands which is about .-040-.050 into the lands. does not it is a bad technique, you just need to remember where you are actually starting from, which is way into the lands.

2. You need a comparator to measure the ogive of the loaded bullet, and not the cartridge OAL. That can vary as much as .017 between bullets in the same box depending on that particular lot.

there are several technical articles on the reloading part of sinclair internationals website, giving very detailed instructions using several tools that they sell that work quite well.

BH
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Old 08-18-2011, 08:31 PM
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Location: NC, oceanfront
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Re: How do I find the lands?

I use an R-P Tool as described well here by Woods:
Reloader's Nest Forum - OAL

It's a cleaning rod approach brubo is describing, and has a flat end for the rod + stops.
This allows me to find actual 'touching' -vs- some amount of jam.
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  #6  
Old 08-18-2011, 09:26 PM
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Join Date: Oct 2008
Location: New York, NY
Posts: 218
Re: How do I find the lands?

Have tried it all get the Sinclair tool formthis and with some practice you will get an avg of.002 differences bw measurements. To me it's definitely the most accurate but always take an avg and discard outliers as mentioned above
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  #7  
Old 08-18-2011, 10:32 PM
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Join Date: Dec 2009
Posts: 107
Re: How do I find the lands?

Thanks for the info!
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