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88MauSporter
.375 member


Reged: 06/06/07
Posts: 530
Loc: Alaska / Texas
.577/.450 Case Problems?
      #106386 - 31/05/08 05:46 AM

I just receved my Martini-Henry Sporter and have performed a good cleaning and inspection. Well worn and used over the years. Plain, but with very nice 5 leaf express sights and a long range ladder sight.
The bore looks in good condition. Some minor pitting and the rifling is worn, but still very strong henry type. I have a box of new TenX brand .577/.450s in Jamison Brass.
I cannot get the cartridge to seat in the chamber and be able to close the action block.
Has anyone experienced this issue with .577/.450 or other Jamison brass? Or, should I look more to the rife?

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"A hunter should not use a rifle that will kill an animal when everthing goes right; you should use one that will do the job when everything goes wrong." 88MauSporter

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DoubleD
.400 member


Reged: 23/11/03
Posts: 2487
Loc: Retired in Oklahoma
Re: .577/.450 Case Problems? [Re: 88MauSporter]
      #106405 - 31/05/08 01:57 PM

Yes, there can be a problem with the 577/450 chamber. But I have never heard of the problem with the 10-X ammo.

There has been a problem with Jamison 577/450 brass. Look at this post and read the links leading over to British Militaria Forum for more details:

http://forums.nitroexpress.com/showflat.php?Cat=0&Number=105286&an=0&page=0#Post105286

If you see any of the problems reported in that post, contact Ten X and let them know. They are good people and should make it right.

What I think your real problem is more to the standard of modern brass having a flat shoulder and the original chamber having a ogee shoulder. The arc of the lower radius of the shoulder binds against the flat shoulder and will not allow the case to fully seat. If you were using foil cases as was intended for this chamber, you wouldn't have a problem. I have copies several different original chamber drawings for this cartridge (Birmingham Proof house holds 37 different drawings)and is a wide variation from drawing to drawing in 2 shoulder radius found in that shoulder.

Oh there is a fix. Get a set of Lee Dies. These were designed for the very tightest Martini chamber and elimiates this problem 99% of the time.

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DD, Ret.

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88MauSporter
.375 member


Reged: 06/06/07
Posts: 530
Loc: Alaska / Texas
Re: .577/.450 Case Problems? [Re: DoubleD]
      #112309 - 23/08/08 08:56 AM

I finally adjusted the shoulders of the Ten=X case by a very slight swage of the angle with the base of my 12.7X44R die. It flattened out the angle just enough to chamber. Ten-X has offered to give me a few empty new cases in exchange for a Fired case in my chamber of the .577/.450. They were very interested in making sure they have usable ammo for most shooters.
TODAY, Finally, after months of ownership, I made it to the range and fired a few rounds.
The Ten-X ammo is loaded with a healthy charge of Hogden777 powder and a missle cone pointed shape 480 grain bullet. Man!! This light sporter does have some authority at both ends and jumps off the bench!! Once I figured out sights (obvious I needed a much higher front), I used the bottom of the target as an aiming point and put 4 shots in about 2 1/2 inches at 50 meters. Not good, but not bad for random loads. Now I can start to tailor for the rifle.
My son shot my Martini .310 Cadet with some of my loads. He shot some very respectable open sight groups. This is the first time he shot it. Martini Rifles, Large and Small. PHotos later.

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"A hunter should not use a rifle that will kill an animal when everthing goes right; you should use one that will do the job when everything goes wrong." 88MauSporter

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belgmart
.275 member


Reged: 29/02/04
Posts: 78
Re: .577/.450 Case Problems? [Re: 88MauSporter]
      #112513 - 25/08/08 08:59 PM

I'm seeing it happen ,you'll have to change your name to Martinisomething or suchlike. Beware, these are extremely addictive, and no known cure exists. I don't even know how many there are in my safe(s)...

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Martini's Rule!

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88MauSporter
.375 member


Reged: 06/06/07
Posts: 530
Loc: Alaska / Texas
Re: .577/.450 Case Problems? [Re: belgmart]
      #112570 - 26/08/08 09:30 AM

Martin:
A year ago, I had 1! today I have 3. .375 Express, .577-.450 and .310 Cadet. I will send photos later on.

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"A hunter should not use a rifle that will kill an animal when everthing goes right; you should use one that will do the job when everything goes wrong." 88MauSporter

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