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Joined: Aug 2007
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Sidelock
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Originally Posted By: pwm
.........what we know: is it a real 10mm /400 and it have a paper thin neck

...........the paper thin brass case is typical for the early express rounds and the 10x60 R 400 comes from one. this is not a 450 basic case necked down.......


.........old chambers are made different than we do it now. I have casting were the chamber ends with the case mouth. no free bore, nothing, the lead bullet engrave into the rifling when loaded.....


PWM, if you drop in from time to time, can you clarify on the neck? Is there a thin neck from the 400 bore transitioning to the rifling? I ask this because I am working with a similar chamber which has a constant chamber diameter for a length of 61mm with the diameter larger than that of the bullet. Then from 61mm to 67mm there is a transition / necking down to 400 kaliber.

Cheers,

Raimey
rse

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For the 1 or 2 still taggin' along, Oxiclean is the ticket to removing the undesirables from the cases. Although I haven't balanced the equations, water seems to be the catalyst? Anyway, natrium perborate or sodium perborate is the key ingredient.


https://www.youtube.com/watch?v=ANeHbCjGIwM

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Raimey
rse

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Thanks Rainey for the brass cleaning tip.

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No worries Tinker & glad to pass it on. Now I am not sure how much to add or if there is a concentrated version of Oxiclean? I 1st purchased a small spray bottle but I am not sure as to the concentration. But the concoction will foam up residue from the cases......

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Raimey
rse

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Got it.

I'll look at the market shelves for whatever assortment of forms of the brand I can find.
I have some brass here that I'll run with this sauce.

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One other think Tinker & that is that the reaction may be more volatile with bona fide black powder instead of the synthetic or psuedo powders with a deflagration origin. For now I have only tried it w/ Pyrodex RS and considering that composition has sulfur that mixture is some more corrosive.

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Raimey
rse

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Seems that in order to get the desired effect, just add more concentrated Oxiclean. One issue I am having is w/ stuck cases after firing. Said stuck cases have to be tapped out w/ a brass rod.

Cheers,

Raimey
rse

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Originally Posted By: ellenbr





https://www.liveauctioneers.com/item/90675497_czech-rifleshotgun-combination-gun-by-jan-burda-i-prag

Jan Burda v Praze DR - 70cm pattern welded tubes(etched) - 13mm bores?

I realize I am resurrecting an old thread but I finally ran across a T breech double where one could read the name on the lug:

ARMAND Bte

Cheers,

Raimey
rse

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