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xring
.224 member

Reged: 03/03/07
Posts: 13
Loc: Michigan, USA

Ruger No.1 from 458 to 450 3.25 NE
#72951 - 03/03/07 07:05 AM

I have been trying to follow the posts concerning conversion (rechambering) the Ruger No.1 in 458 Win to 450 3.25 Nitro Express. Having measured both cases and my 450 NE reamer it appears that rechambering will work fine. My question is does the breech block need to be altered for the 450's rim to clear on ejection? Any help will be greatly appreciated.

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akjeff
.300 member

Reged: 20/01/04
Posts: 121

Re: Ruger No.1 from 458 to 450 3.25 NE [Re: xring]
#72984 - 03/03/07 02:34 PM

My 450#2 conversion required a breech block alteration. Not sure if it has the same rim diameter as the 3-1/4"??

Jeff

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500Nitro
.450 member

Reged: 06/01/03
Posts: 7244
Loc: Victoria, Australia

Re: Ruger No.1 from 458 to 450 3.25 NE [Re: akjeff]
#72985 - 03/03/07 02:35 PM

I am pretty sure 450 No 2 is thicker rimmed than
450 3 1/4"

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bouldersmith
.375 member

Reged: 23/03/06
Posts: 609
Loc: Boulder Colorado

Re: Ruger No.1 from 458 to 450 3.25 NE [Re: 500Nitro]
#72986 - 03/03/07 02:41 PM

450 #2 is thicker and larger in diameter than .450 3&1/4". My guess is that the alteration was to allow much larger diameter of the # 2 rim to clear the top of the breech block. I'm unsure if the same would be required of the 3&1/4" cartridge.

Steve

--------------------
New website http://www.bertramandco.com

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Raff
.300 member

Reged: 12/01/04
Posts: 182
Loc: Texas

Re: Ruger No.1 from 458 to 450 3.25 NE [Re: bouldersmith]
#72990 - 03/03/07 04:04 PM

The .450-3 1/4 rim diameter is about .620" and this
size rim should work without any modifications to the
breech block. My No. 1 did not have the breech changed
for the 3 1/4" rechamber from .458WM.
Any larger and you will have to work it over a bit.
Raff

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.

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xring
.224 member

Reged: 03/03/07
Posts: 13
Loc: Michigan, USA

Re: Ruger No.1 from 458 to 450 3.25 NE [Re: Raff]
#73018 - 04/03/07 12:54 AM

I am in the process of building a 3 1/4 on a J. P. Saurer action but the project is taking a lot longer than expected. I was therefore looking for an additional option to get a 450 up and running and the Ruger 458 conversion looked like a straight forward, relatively simple approach. The question of breech-block clearance was/is really the only obstacle. From all of your comments it appears that I should get on the stick and rechamber a 458.
Thank you all and an advanced thank you for any others who care to comment on this proposed conversion
Dan

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DarylS
.700 member

Reged: 10/08/05
Posts: 26526
Loc: Beautiful British Columbia, Ca...

Re: Ruger No.1 from 458 to 450 3.25 NE [Re: xring]
#73051 - 04/03/07 06:23 AM

The only change needed should be an extractor. A friend of mine re-barreled his Ruger #1 from .375H&H to .17AckHornet. Ruger sent him 3 new extractors before he got the right one - that took over 6 months of communication with them on the phone.

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

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

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xring
.224 member

Reged: 03/03/07
Posts: 13
Loc: Michigan, USA

Re: Ruger No.1 from 458 to 450 3.25 NE [Re: DarylS]
#73060 - 04/03/07 07:14 AM

Daryl, thanks for the note. I had thought I would recut the extractor while rechambering. Do you see that as a potential problem?

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Bramble
.375 member

Reged: 29/07/06
Posts: 950
Loc: England

Re: Ruger No.1 from 458 to 450 3.25 NE [Re: xring]
#73084 - 04/03/07 01:35 PM

Brownalls carry the Ruger extractors. And in any event they would be very simple to file out from solid if needs be out of a piece of O2 or A2. I rebarreled mine to 6mm BR Norma from .300WM so had it apart a dozen times and changed the extractor. Yes there is a problem with cutting both at the same time in that the extractor is designed to move out of the way left horizontally for rimless cartridges so it would tend to move out of the way of the rim cut on the reamer. I think that you would have to wedge it in its contact position to the right when you machined the rim.

Regards

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450
.300 member

Reged: 30/12/06
Posts: 199
Loc: Melbourne,Victoria, Australia

Re: Ruger No.1 from 458 to 450 3.25 NE [Re: Bramble]
#73093 - 04/03/07 02:09 PM

Xring
I have just had my #1 tropical rechambered from 458 to 450 3 1/4 NE. The breachblock does have to have the loading groove opened out to enable the rifle to be loaded easily and to ensure proper extraction/ejection. It is the rim of the 450 that causes the problem if you do not have it done. I am extremely happy with mine and it shoots extremely well. I am putting a decerator recoil pad on it and a NECG aperture sight. I shoot both black powder loads and nitro loads in comp. The open sights will be for black powder and the peep light for nitro and hunting. I have had no extraction or ejection problems. I had the front of the safety flattened a bit so the cases clear the action during ejection. This is absolutely a must for quick follow up shots when I get a chance to go after Water buffalo in the Northern Territory next year. I hope you enjoy your new toy.

--------------------
The worst days shooting and hunting is better than the best day at work

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xring
.224 member

Reged: 03/03/07
Posts: 13
Loc: Michigan, USA

Re: Ruger No.1 from 458 to 450 3.25 NE [Re: 450]
#73135 - 05/03/07 01:27 AM

Thank you, Bramble and 450. I have a couple Ruger No.1s (one in 30-30 for long-range single shot competition and a 7mm Mag for hunting). In eyeballing those it did appear to me that some material would have to be removed from the top of the breech block, but it was very close hence the question. The comments on the extractor/ejector solution and cutting down the safety are both appreciated. Actually, on my 7mm, I too flattened the front of the safety. As cartridges were ejected the base would hit the safey and stop right there requiring hand removal...not a problem on the target rifle but certainly a nuisance on a hunting rifle.
Dan

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xausa
.400 member

Reged: 07/03/07
Posts: 2037
Loc: Tennessee, USA

Re: Ruger No.1 from 458 to 450 3.25 NE [Re: Bramble]
#74925 - 29/03/07 07:52 AM

I redid a Ruger No. 3 to .450 C&W (a rimmed .450 Watts) using a .458 Winchester Magnum barrel from a No. 1. I fitted it with a .45-70 extractor to accomodate the rimmed case (brass is necked up .375 H&H Flanged) and discovered to my surprise that the rifle now accepts, extracts and ejects .450 Watts belted cases as well. As I restrict my loadings to .458/.450 NE performance, the recoil is not a problem and the pressures are commensurately low.

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