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Dogfish858
.300 member

Reged: 08/08/15
Posts: 190
Loc: Western Canada

Martini Enfield Rebarrel
#378004 - 18/07/23 11:10 PM

In a few days I should be the proud owner of a tatty English (not Khyber, which are more common here) Martini.

The rifle caught smallpox somewhere down the line and the bore is toast.

Can anybody see issues using .307 Winchester as a rebarrel? I have the barrel and the .308 reamer which I assume can do most of the work. It wouldn't need to be hot loaded I just have the stuff for it. I'd set it up for 130 gr.

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But what about you? he asked. Who do you say I am?

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93x64mm
.416 member

Reged: 07/12/11
Posts: 3987
Loc: Nth QLD Australia

Re: Martini Enfield Rebarrel [Re: Dogfish858]
#378007 - 19/07/23 06:20 AM

DoubleD is your man for ANYTHING Martini.
I'd run it past him Dogfish.
If it's in .303 then I'd say you won't be up for much work with the extractor.
Not sure if you can locate a still 'new'.303 barrel & whether you can just thread one in!

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DoubleD
.400 member

Reged: 23/11/03
Posts: 2398
Loc: Retired in Oklahoma

Re: Martini Enfield Rebarrel [Re: 93x64mm]
#378009 - 19/07/23 11:59 AM

Is the gun complete and original? Does it bear any markings identifing past military history?

Complete and original in decent shape in .303 British with trashed bore it is $1000 gun. A bit more with specific unit markings and good bore.

Rebarrel to .307 Winchester, it becomes $400-$500 gun.

Reline the bore keeping it .303 Brit back to $1000 gun and maybe more.

The .307 is s 52,000 psi cartridge. The problem with loading down, is the next owner might not. Making the guy who built the gun liable.

The .303 Brit is a 45,000 psi gun.

The rule of thumb is never chamber a gun for cartridge of higher pressure than the original.

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DD, Ret.

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Dogfish858
.300 member

Reged: 08/08/15
Posts: 190
Loc: Western Canada

Re: Martini Enfield Rebarrel [Re: DoubleD]
#378014 - 19/07/23 10:40 PM

Thanks DD.

I'd figured that the .308 firing 150 gr and the .303 firing 150 gr came within 150 fps of each other and wouldn't generate particularly different chamber pressures or bolt thrust in so doing.

There are no military marks. It's an old sporter. If the bore cleans up I may leave it as is, but I want a scoped single shot for hunting.

--------------------
But what about you? he asked. Who do you say I am?

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DoubleD
.400 member

Reged: 23/11/03
Posts: 2398
Loc: Retired in Oklahoma

Re: Martini Enfield Rebarrel [Re: Dogfish858]
#378015 - 20/07/23 09:26 AM

Chamber pressure is relevant of course.

Bolt thrust is a modern engineering term irrelevant in this case as the action already exists. It has to do with design of an action to resist the forces of rearward thrust of propellant gases. Once the gun is built the factor is resolved. You can't change the make up the gun. I have never seen any numbers expressing the max bolt thrust the Martini was built to withstand.

Cartridges are not measured by bolt thrust either, rather by chamber pressure.

Old Sporter? A cut down military rifle? Nothing ventured, nothing gained. Rechamber, rebuild by all means. But stay at or under the chamber pressure numbers for a .303 Brit in this case.

A Martini Sporting rifle, a gun purpose built for sporting use, absolutely reline. Rebuild in a caliber that has the
same pressures as cartridges originally used in this gun.

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DD, Ret.

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blackbahart
.224 member

Reged: 29/10/15
Posts: 16
Loc: British Columbia Canada

Re: Martini Enfield Rebarrel [Re: DoubleD]
#378783 - 20/08/23 02:10 PM

did a bit of a custom on a martini a few years ago
was a 303 originally and rebarreled it again to 303

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Dogfish858
.300 member

Reged: 08/08/15
Posts: 190
Loc: Western Canada

Re: Martini Enfield Rebarrel [Re: blackbahart]
#380904 - 04/12/23 10:38 AM

I do also have an 8x57 barrel and reamer -- maybe an 8x57jrs loaded to North American commercial levels?

Can also get a .303 barrel to spin in but the reamers are hard to find in Canada for some reason and the barrels are too short (22 inch). I want 24 inches plus.

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But what about you? he asked. Who do you say I am?

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