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Double Rifles, Single Shots & Combinations >> Double Rifles
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paradox
.224 member


Reged: 03/04/08
Posts: 37
Loc: The Netherlands
Nitro Proof
      #101591 - 05/04/08 03:06 AM

Dear friends,

I have a .577 3" BP Express double rifle. Does anyone have an idea if nitro proofing would be an option? I have heard that besides the difference in pressure there is a problem with regulating the rifle and there is supposed to be different twists of the bores.
If not, what would be a practical hunting load? Would it be an option to us Pirodex f.e? I cannot find loads for this round in the Pirodex data.

With kind regards,

Huub

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peter
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Reged: 11/04/07
Posts: 1493
Loc: denmark
Re: Nitro Proof [Re: paradox]
      #101598 - 05/04/08 05:55 AM

hi huub

what you need is a Nitro For Black load, search the reloading section for loads or get greame wrights book: shooting the english double rifle.

best regards

peter

P.S

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Anonymous
Unregistered




Re: Nitro Proof [Re: paradox]
      #101602 - 05/04/08 07:13 AM

Huub,

Peter is correct. What your looking for is Nitro for Black. Ask for Larry.

http://www.superiorammo.com/

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Marrakai
.416 member


Reged: 09/01/03
Posts: 3494
Loc: Darwin, Top End of Australia
Re: Nitro Proof [Re: ]
      #101641 - 05/04/08 12:01 PM

What peter said!

The invention of smokeless powder over a century ago made all BP loads obsolete instantly, however the rifles were not obsolete and most would last several more decades, many into this, their second century!

At the time, the trade responded with smokeless loads that would regulate in the old BP doubles, with a number of very significant advantages!

1. No smoke-cloud to obscure the quarry, therefore faster follow-up shot from the second barrel

2. Heavier jacketed bullet than the original BP lead projectile, at the same velocity

3. Lower pressure, meaning less wear and tear on the rifle, and longer life.

4. No corrosive fouling in the barrel all day after an early shot in the hunting field

As an example: my .577 Light Nitro double regulates with a 650gr jacketed soft-point at 1665 fps for between 7 and 8 tons chamber pressure. That's 4000 ftlbs muzzle energy with a bonded-core bullet. Hell of a hunting cartridge!

The original .577 BP cartridge fired a 560 or 570gr lead bullet at 1650 fps and around 10 tons breech pressure. That's 3,450 ftlbs ME. Less energy, and higher pressure! ...with a smoke-cloud!

Pretty simple math!

I consolidated my thoughts on the .577 Light Nitro cartridge a while back, and tossed it up on the web here. Long-time NE.com posters are sick of seeing it, but since you're interested in this cartridge...
(mine is the 2 3/4 inch version, but the same sentiments apply to the 3-inch cartridge).

...and like peter, I strongly recommend Graeme Wright's book, though it looks like we're all waiting for the third edition as the second has apparently sold out. Can you borrow a copy...?


I guess what we're saying is that nitro proofing an old BP DR is generally not recommended, and in the light of the above information, is not necessary!


--------------------
Marrakai
When the bull drops, the bullshit stops!
--------------------------------
www.marrakai-adventure.com.au

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paradox
.224 member


Reged: 03/04/08
Posts: 37
Loc: The Netherlands
Re: Nitro Proof [Re: Marrakai]
      #101651 - 05/04/08 01:30 PM

OK,

Thank you all very much for the information.
It's a great help.

With kind regards,

Huub.

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paradox
.224 member


Reged: 03/04/08
Posts: 37
Loc: The Netherlands
Re: Nitro Proof [Re: paradox]
      #101936 - 08/04/08 03:14 AM

Hello Pieter and Marrakai,

I have tried to get Greame Wright's book, but it's sold out as you mentioned.
the retailer told me thet the 3rd edition will be released within a few months, so that is good news.
I found one 2nd ed. on the internet, but they asked the outrageous price of $160. Can you believe that!!! When I asked him wether the price was a mistake (or to find out if he was a nutter!), he said it (he) wasn't and the copy had already sold. Now that is what I call a book in demand.
It looks like a mutch better investment than the stockmarket.

regards,

Hubert

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Bwana_Be_Mike
.224 member


Reged: 28/03/08
Posts: 31
Loc: PA _U.S.A.
Re: Nitro Proof [Re: paradox]
      #102143 - 11/04/08 01:58 AM

Hi :
I wonder if the book you mention would answer my quiry below /

New to the sight & I wasn't sure where to post this but I was wondering
if someone could enlighten me to some of the different Crown over Initial
Proof Marks that I've seen seen over the years. I 've seen Crown N stampings
which I believe means modern gunpowder not blackpowder. Correct me if I'm
wrong.

What does Crown over U , & Crown over R denote ? Could someone educate me on some
of the more common proof marks ?
Thanks;

Mike

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paradox
.224 member


Reged: 03/04/08
Posts: 37
Loc: The Netherlands
Re: Nitro Proof [Re: Bwana_Be_Mike]
      #102148 - 11/04/08 02:43 AM

Dear Mike,

Please check the link below.
Hope this answers your question.

https://store.bluebookinc.com/Info/PDF/Firearm/Proofmarks.pdf

With kind regards,

huub.

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Bwana_Be_Mike
.224 member


Reged: 28/03/08
Posts: 31
Loc: PA _U.S.A.
Re: Nitro Proof [Re: paradox]
      #102163 - 11/04/08 07:11 AM

huub:

WOW ! Thanks ! I'm Impressed ! That's definitely more more
information than I expected to receive & in such a short
period of time !

Thanks again !
Mike

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