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Shooting & Reloading - Mausers, Big Bores and others >> Big Bore Rifles

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jlbell
.224 member

Reged: 08/11/05
Posts: 7
Loc: Alabama, USA

Interarms Mk. X (Whitworth) cartridge size
#41222 - 11/11/05 06:07 AM

I have an Interarms Mk. X (Whitworth marked) action (only), unused, still in original box. .458 Win Mags will fit (easily) in the magazine and will fit the bolt face and will extract. My question is: How do I determine if this action is long enough to take the .458 lott? .416 Rigby will fit in the magazine but its obvious they are to long to extract loaded (also hard to feed out of the magazine box). Is there an easy way to determine if my action is large enough for the .458 lott?

Funds are somewhat limited and I'm really just looking for something big bore to shoot. I have the action and I have a nice piece of walnut to put it in.

Thanks,

jlbell

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WyoJoe
.300 member

Reged: 18/02/04
Posts: 234
Loc: Cheyenne, WY USA

Re: Interarms Mk. X (Whitworth) cartridge size [Re: jlbell]
#41229 - 11/11/05 07:15 AM

It can be opened up for the Lott. Your gunsmith will have to lengthen the magazine and massage the feed rails & ramp. My .300 H&H was built on a .458 length Mark X action and that is what my 'smith did. It is now wearing a .375 H&H barrel. I have been shooting that gun for 20 years or so opened up and it has never given me any problems. One thing I would recommend is having a gunsmith who has built dangerous gane rifles do your work.

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There comes a time when one must take a position that is neither safe, nor polite, nor popular -- but one must ask, "Is it right?"

Martin Luther King, Jr.

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luv2safari
.400 member

Reged: 09/11/03
Posts: 1413
Loc: United States

Re: Interarms Mk. X (Whitworth) cartridge size [Re: jlbell]
#41249 - 11/11/05 12:56 PM

I handled quite a few when we sold them new, but I don't remember whether the 458 had the same length action as the 375. If so, why wouldn't it handle the lott with ease?

--------------------
Hunt with Class and Classics

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jlbell
.224 member

Reged: 08/11/05
Posts: 7
Loc: Alabama, USA

Re: Interarms Mk. X (Whitworth) cartridge size [Re: luv2safari]
#41334 - 12/11/05 08:41 AM

Well, I hope that is the case! I'll have someone who builds rifles take a look at it.

Thanks,
jlbell

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WyoJoe
.300 member

Reged: 18/02/04
Posts: 234
Loc: Cheyenne, WY USA

Re: Interarms Mk. X (Whitworth) cartridge size [Re: luv2safari]
#41341 - 12/11/05 10:39 AM

In reply to:

........ I don't remember whether the 458 had the same length action as the 375. If so, why wouldn't it handle the lott with ease?

They are 2 different length actions. But what my 'smith did was what Interarms did at the factory. It is a simple and realatively easy job.

--------------------
There comes a time when one must take a position that is neither safe, nor polite, nor popular -- but one must ask, "Is it right?"

Martin Luther King, Jr.

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ramrod340
.224 member

Reged: 01/11/05
Posts: 16
Loc: Parker, CO

Re: Interarms Mk. X (Whitworth) cartridge size [Re: WyoJoe]
#41524 - 14/11/05 11:32 PM

The action itself is the same length between the 375 & 458. The magazine box on the 375 is extended in the front. The extension is made so that the trigger guard for the 375 & 458 will both fit in opening in the bottom of the stock. Depending on the inletting some internal wood removal might be required. The feed ramp is then altered to match. I can't speak as to how much the rails are opened.

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Just my 2 cents.

Paul K

Edited by ramrod340 (16/11/05 06:26 AM)

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luv2safari
.400 member

Reged: 09/11/03
Posts: 1413
Loc: United States

Re: Interarms Mk. X (Whitworth) cartridge size [Re: WyoJoe]
#41587 - 15/11/05 03:57 PM

WyoJoe,

I thought they would be the same basic action. They can be re-worked to take a Lott, much as Dennis Olson turned my dad's old Mdl 70 in '06 into a 375 H&H for me, with the addition of a barrel from Ray Atkinson's stash of old parts...

By the way, I have a minty original Win 70 pre '64 30-06 barrel for sale.

--------------------
Hunt with Class and Classics

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WyoJoe
.300 member

Reged: 18/02/04
Posts: 234
Loc: Cheyenne, WY USA

Re: Interarms Mk. X (Whitworth) cartridge size [Re: luv2safari]
#41667 - 16/11/05 09:25 AM

ramrod340 said it the way I should of. The action is the same size but the magazine is different. Dennis Olson was the one that built my .375. It is the same action that my .300 H&H was on.

--------------------
There comes a time when one must take a position that is neither safe, nor polite, nor popular -- but one must ask, "Is it right?"

Martin Luther King, Jr.

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iwantadouble
.300 member

Reged: 06/06/05
Posts: 104
Loc: Gallatin County, Montana

Re: Interarms Mk. X (Whitworth) cartridge size [Re: luv2safari]
#41676 - 16/11/05 11:08 AM

I took a couple of pictures as a visual aid. Do not have an Interarms to compare to, but the Pre64 Winchesters should illustrate it well enough.

Original .30-06 (1954) Action is here.

Original .375 H&H (1955) Action is here.

The bolts side by side are here.

Obviously the magazines are different, as are the feed rails. You can see from the pictures how Winchester got the .375 to feed into the magazine by trimming the rear ring back for the longer cartridge. I would imagine all that is needed for the Lott conversion on the Interarms would be some similar feed rail modification for the longer cartridge, some trimming of the rear reciever ring, and a longer magazine box.

--------------------
500 is a nice round number, either followed by "Nitro Express" or by "cubic inch displacement".

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jlbell
.224 member

Reged: 08/11/05
Posts: 7
Loc: Alabama, USA

Re: Interarms Mk. X (Whitworth) cartridge size [Re: iwantadouble]
#41755 - 17/11/05 06:02 AM

I appreciate everyone’s input. I was under the impression that the action I have would handle the .458 Lott, but in "over thinking" the idea, I started to wonder. I believe it will work, and "iwantadouble's" pics showed me something I wasn't thinking about (Opening up the rear to accept the cartridge). I've talked (briefly) to a riflesmith and looks like we can get started first of the year.

Thanks for your help

Jerry

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