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Shooting & Reloading - Mausers, Big Bores and others >> Big Bore Rifles
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Ash
.400 member


Reged: 10/05/11
Posts: 1654
Loc: Australia
Nitros and Worn Bores
      #279788 - 25/03/16 10:23 AM

Good morning, and Good Friday!

Question: Does a worn or "tired" bore affect the accuracy as much on a rifle of .400+ caliber as it does on say a .30?

There is a .450/400 3 1/4" nitro I'm thinking of having a crack on but it is a very used rifle. This is the response I got when asked of bore condition. It's not a double rifle.

"The bore is worn and tired and lightly pitted."


Cheers,
Ash.

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.

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gryphon
.450 member


Reged: 01/01/03
Posts: 5487
Loc: Sambar ground/Victoria/Austral...
Re: Nitros and Worn Bores [Re: Ash]
      #279790 - 25/03/16 11:22 AM

Going for Buff Ash?
Get in tight at 20 yards like everyone else does..you wont worry if the pipe is worn ha ha.

--------------------
Get off the chair away from the desk and get out in the bush and enjoy life.

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Ash
.400 member


Reged: 10/05/11
Posts: 1654
Loc: Australia
Re: Nitros and Worn Bores [Re: gryphon]
      #279792 - 25/03/16 11:32 AM

Maybe later this year, but with the .450

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LesLeeSpeed
.300 member


Reged: 14/11/13
Posts: 223
Loc: Queensland Australia
Re: Nitros and Worn Bores [Re: Ash]
      #279800 - 25/03/16 01:25 PM

Hi Ash,
If it's really badly worn you may get it to shoot acceptably with 416 projectiles, either that or cast up to the bore size. What condition is the rest of the rifle in?
Les

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Ripp
.577 member


Reged: 19/02/07
Posts: 16072
Loc: Montana, USA
Re: Nitros and Worn Bores [Re: Ash]
      #279865 - 26/03/16 11:23 AM

Quote:

Good morning, and Good Friday!

Question: Does a worn or "tired" bore affect the accuracy as much on a rifle of .400+ caliber as it does on say a .30?

There is a .450/400 3 1/4" nitro I'm thinking of having a crack on but it is a very used rifle. This is the response I got when asked of bore condition. It's not a double rifle.

"The bore is worn and tired and lightly pitted."


Cheers,
Ash.



I have a WR in .470 Nitro --had some work done on it and was told by the very knowledgeable gunsmith about 1/2 the life of the barrel was gone..but was also told this was one of the most accurate doubles he has ever shot..

Ripp

--------------------
ALL MEN DIE, BUT FEW MEN TRULY LIVE..

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SharpsNitro
.375 member


Reged: 12/08/08
Posts: 729
Loc: Arizona, USA
Re: Nitros and Worn Bores [Re: Ripp]
      #279874 - 26/03/16 12:17 PM

I had a Winchester 92 in 44-40 that had a scary looking bore but still shot well. The best way to know is to shoot it (may not be helpful advice). I think bore quality is more critical for higher pressure and velocity cartridges.

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xausa
.400 member


Reged: 07/03/07
Posts: 2037
Loc: Tennessee, USA
Re: Nitros and Worn Bores [Re: SharpsNitro]
      #279893 - 27/03/16 12:01 AM

When I made my first trip to Kenya in 1971, Len Bull, the manager of Kenya Bunduki, a prominent gun shop in Nairobi, gave me the run of his gun vault. The rifles I selected to send home were primarily bolt action repeaters, thus easy to rebarrel, but almost without exception the rifle bores suffered from cartridges loaded with cordite, which burns at a much higher temperature than modern rifle powders and for that reason causes much more erosion of the chamber throat, an accuracy killer at long range in target rifles, but less so for shooting at closer ranges. The accuracy of my high power target rifles often started to trail off around 2000 rounds when throat erosion began to be noticeable. Setting the barrel back and rechambering it made it good for another 2000 rounds.

The nice thing about a 450/400 3 1/4" is that it can be rebored and rechambered to .450 NE, if the accuracy is disappointing.

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DarylS
.700 member


Reged: 10/08/05
Posts: 27730
Loc: Beautiful British Columbia, Ca...
Re: Nitros and Worn Bores [Re: xausa]
      #279896 - 27/03/16 02:59 AM

Badly worn bores will usually not shoot cast bullets well, while a simply worn throat in a rifle bore usually shoots cast bullets even better than when new. Worn bores or throats can still shoot jacketed bullets quite well.

I have a Palma match barrel that went through roughly 15,000 rounds of hard-ball 7.62x51, which burned out about 8" of rifling at the origin. It was still shooting 180gr. MK's into 1" at 100 meters - not good but not spraying them either.

I shortened the barrel by 4", re-threaded it onto a Mauser action and chambered it for a little wildcat I'd thought up to duplicate the .30BR. I still have that barreled action and although there is no rifling for about 1 1/2", it shoots 1/2" with 130gr. to 165gr. bullets.

So - you have to shoot it to find out. Small bores usually fair poorly with less "wear" than larger bores, showing flyers and greatly expanded groups with wear that larger bores shrug off.


The larger the bore, the less effected they are, generally speaking.

--------------------
Daryl


"a gun without hammers is like a Spaniel without ears" King George V

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Ash
.400 member


Reged: 10/05/11
Posts: 1654
Loc: Australia
Re: Nitros and Worn Bores [Re: DarylS]
      #279916 - 27/03/16 11:01 AM

Thanks for the thoughts guys.

I'll have a crack at winning it. Wish me luck!

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