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Hot Topic (More than 10 Replies) Bullet distance from the lands. (Read 9944 times)
Nero
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Bullet distance from the lands.
Jun 24th, 2015 at 7:32pm
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Does a gunsmith have any control over the depth to the lands or does it all depend on who made the reamer ?
Regards.
« Last Edit: Jun 24th, 2015 at 9:02pm by Nero »  
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marlinguy
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Re: Bullet distance from the lands.
Reply #1 - Jun 24th, 2015 at 11:26pm
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Lands are determined by the size hole the barrel maker makes. The grooves depend on how the rifling is made. Some methods as the cut rifling old barrel makers used will allow the barrel maker to continue to cut grooves deeper until they are where he wants them. 
If using a broach or button, then the size of that will determine the depth of the grooves. Same for hammer forged rifling, which is done over a reverse pattern on the mandrel.
  

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oneatatime
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Re: Bullet distance from the lands.
Reply #2 - Jun 24th, 2015 at 11:40pm
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Marlinguy, I suspect he is talking about the throat/leade etc. dimensions.
  
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westerner
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Re: Bullet distance from the lands.
Reply #3 - Jun 25th, 2015 at 12:24am
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Bullet distance from the lands.

Yes, gunsmith is able to ream the lead using a throating reamer. Confusing aint it.  Some here will call it freebore. Get's even more confusing. Then maybe somebody throws in "ballsocket".  Or, was it ballseat?? Grief! 

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Nero
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Re: Bullet distance from the lands.
Reply #4 - Jun 25th, 2015 at 12:33am
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Yes sorry about, I didn't explain myself very well.
I did mean the bullet jump.
The gunsmith I have been using for the last twenty years or so has just finished my new 5.6x50R BSA Martini and where as the other six Martini's he has done for me I have always been able to put the bullet either touching or ten to twenty thou off the lands this one has quite a jump.
One in twelve twist on this one and the previous break open rifle in this calibre he did for me had a one in seven barrel for a seventy grain bullet but I haven't loaded for this one yet and am still using factory 55 grain ammunition. 
Which was why I was wondering if he had forgotten that this one was for a fifty or fifty five grain bullet or it was down to the reamer used?
  
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nuclearcricket
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Re: Bullet distance from the lands.
Reply #5 - Jun 25th, 2015 at 9:08am
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Normally the area you are talking about is controlled by the reamer. If you want an extra long throat or free bore that can be done with a separate reamer. Unless you had mentioned specifics on how you wanted the chamber/throat to be cut, my guess is that he would rent a reamer and just use what had been ground on it. 
Worse case is that if it doesn't work well or shoot well with the way it was reamed, you would only have to set it back a thread or 2 at the most and have it rechambered. If you go to PT&G web site they do have drawings of most of their reamers on their site and if it isn't posted you can mail them and have a print sent to you. 
Sam
  
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Adrian
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Re: Bullet distance from the lands.
Reply #6 - Jun 25th, 2015 at 4:24pm
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[quote author=2B30262920243726372C262E2031450  If you go to PT&G web site they do have drawings of most of their reamers on their site and if it isn't posted you can mail them and have a print sent to you. 
[/quote]

How long would it take to have a custom reamer made and delivered?.

  
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nuclearcricket
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Re: Bullet distance from the lands.
Reply #7 - Jun 25th, 2015 at 6:19pm
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I don't know for sure but I would take a guess that your probably looking at several months for a custom reamer. Your best bet would be to either email or call PTG and get the answer right from them. 
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JLouis
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Re: Bullet distance from the lands.
Reply #8 - Jun 25th, 2015 at 7:09pm
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A call would indeed be best. Sometimes their turn around time is really quick, sometimes not based on current amount of outstanding orders. I highly recommend you design the reamer the way you want it. Custom reamers are generaly less than a new bullet mould and a real bargain in my book. You can at times sell it if your chamber is a one of and get almost all of your money back out of it if not all of it. Properly taken care of it will cut alot of chambers.

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JS47
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Re: Bullet distance from the lands.
Reply #9 - Jun 25th, 2015 at 10:17pm
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I ordered a custom reamer from Manson Reamers.  They gave me a 4 week lead time.  When it showed up in 2 weeks I was a happy customer. Smiley

JS
  
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Nero
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Re: Bullet distance from the lands.
Reply #10 - Jun 28th, 2015 at 7:16pm
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Update regarding the free-bore on my new rifle.
Four shots had the rifle sighted in at 25 metres after I had bore sighted it in the previous day and then moved onto the 100 metre range.
Using a starting load of 26.5 grains of ADI 2208 and a 55 grain home made bullet using Corbin jackets I finally after a bit of frustration with the 4x32 Secondhand Japanese Miroko scope which I was using because all these modern scopes have what seems to be a universal large rear end and I needed all the clearance I could get for loading this pretty long cartridge into the breach of the martini. Got the rifle shooting where I wanted it and was pleased to see it is a minute of angle rifle despite the free bore of around .167 to the lands.
Or perhaps it was because of the free bore or I had lapped the barrel with steel wool before firing.
Please see my other post today under barrel break in under general items.
  
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JLouis
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Re: Bullet distance from the lands.
Reply #11 - Jun 28th, 2015 at 7:38pm
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Beautiful Rifle Nero!

JLouis
  

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JerryH
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Re: Bullet distance from the lands.
Reply #12 - Jun 28th, 2015 at 9:23pm
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Nero,

A fine looking rifle indeed!

What kind of wood is the stock made from? 

JerryH
  

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Re: Bullet distance from the lands.
Reply #13 - Jun 28th, 2015 at 9:32pm
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JerryH wrote on Jun 28th, 2015 at 9:23pm:
What kind of wood is the stock made from?

My guesses will be circassian walnut or English walnut.
  

All of my single shots shoot one tiny ragged hole with cast bullets ... it's just the following shots that tend to open up my groups Wink ...
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Nero
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Re: Bullet distance from the lands.
Reply #14 - Jun 30th, 2015 at 1:35am
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Yes Circassian.
  
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