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Very Hot Topic (More than 25 Replies) Danish RB (Read 17096 times)
cheatin_charlie
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Re: Danish RB
Reply #15 - Feb 20th, 2016 at 5:17pm
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Singleshotlover wrote on Feb 20th, 2016 at 12:31am:
Might be my old eyes but your pic has led me to ask this question.  In looking at the breech block just where the hammer sits when fired is that a crack in the block?. See sort of a black line just above the hammer. Frank

 
What you are seeing is the firing pin retractor.  When you drop the block it rides
under the hammer and cams the firing pin back.
  
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tbird1960
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Re: Danish RB
Reply #16 - Feb 20th, 2016 at 5:52pm
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The purpose of that feature is to prevent the firing pin from sticking with black powder residue in the forward position and firing the gun when the breech is closed on the next round. A very good feature on a Rolling Block.
  
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dohrmc
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Re: Danish RB
Reply #17 - Feb 20th, 2016 at 7:57pm
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Just did a chamber cast, Cerrosafe. I have read to wait one hour before measuring it. Never done such a thing, but it was easy. Modeling clay in extractor groove removal was not even that bad.

Sitting here watching the clock.
  
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dohrmc
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Re: Danish RB
Reply #18 - Feb 20th, 2016 at 9:04pm
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(You need to Login or Register to view media files and links)

The chamber cast cam out nicely. However, it is a very smooth transition to the rifling. I have the calipers set at 2.01", or 51mm, as depicted in the George Nonte Cartridge Conversion book.

Question to the experts: is this length case going to be too short? I have never seen the bullet fired out of this thing, so I don't know if this length case is too far from the beginning of the rifling.
The other length cartridge, 56mm, is right up into the beginning of the rifling. 

Appears to be .462 groove to groove.
  
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westerner
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Re: Danish RB
Reply #19 - Feb 20th, 2016 at 9:39pm
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Assume mine had a reversible firing pin. Not now. As the breech block is rotated back firing pin is forced to retracted. Good safety feature. 

As for springs, I prefer flat springs to music wire. My Danish is a favorite plinker rifle. 

           Joe.
« Last Edit: Feb 20th, 2016 at 9:55pm by westerner »  
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Singleshotlover
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Re: Danish RB
Reply #20 - Feb 20th, 2016 at 11:43pm
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Westener's pic of the breech block clears up my crummy eyes leading me to beleving that there was a crack in the breech block. Thanks again, Frank
  
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craigster
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Re: Danish RB
Reply #21 - Feb 21st, 2016 at 12:44am
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I have one, use 45-70 brass, Lee 405 bullets 20:1, 60gr ff compressed with a .030 wad on top. Shoots very well.

More input here: (You need to Login or Register to view media files and links)
  
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majorfs45
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Re: Danish RB
Reply #22 - Feb 21st, 2016 at 9:53pm
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If you order some brass from Buffalo Arms, it is made from .348 Winchester Brass which is a touch larger case over the .45-70 and a better case to use for the rifle.

You will notice in his photo of the breech block in the open  position, this one rifle was originally a rimfire 11.7 x 51R or the next longer case and was converted to a centerfire.  These are well made rolling blocks.
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« Last Edit: Feb 21st, 2016 at 9:58pm by majorfs45 »  
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dohrmc
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Re: Danish RB
Reply #23 - Feb 22nd, 2016 at 1:06pm
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Very nice!
  
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westerner
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Re: Danish RB
Reply #24 - Feb 22nd, 2016 at 9:11pm
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dohrmc, Is the rifling in your Danish five groove? If so how did you measure it?

          Joe.
  
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dohrmc
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Re: Danish RB
Reply #25 - Feb 22nd, 2016 at 11:17pm
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I will check in the morning, but I could swear it is 6 groove. I have made easy math errors before though.

I have 2 micrometers, one is a nice Lyman. Will recheck in the am.
  
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dohrmc
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Re: Danish RB
Reply #26 - Feb 23rd, 2016 at 10:12am
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I was wrong, it is five groove. It is hard to get a good reading of the lead slug due to that. At least with my fumble fingers. 
The good news is that the rifling is very good and sharp.
With 5 grooves, how do you get a good reading?
  
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westerner
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Re: Danish RB
Reply #27 - Feb 23rd, 2016 at 10:23am
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I measure this way. Close enough for me. 



          Joe.
  
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dohrmc
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Re: Danish RB
Reply #28 - Feb 23rd, 2016 at 10:36am
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AHA! I will try that.
  
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JackHughs
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Re: Danish RB
Reply #29 - Feb 23rd, 2016 at 8:30pm
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Quote:


The chamber cast cam out nicely. However, it is a very smooth transition to the rifling. I have the calipers set at 2.01", or 51mm, as depicted in the George Nonte Cartridge Conversion book.

Question to the experts: is this length case going to be too short? I have never seen the bullet fired out of this thing, so I don't know if this length case is too far from the beginning of the rifling.
The other length cartridge, 56mm, is right up into the beginning of the rifling. 

Appears to be .462 groove to groove.


The major issue with using .45-70 brass in the Danish RB's is that the diameter of the chamber near the base is approximately .012" larger than a .45-70 chamber.  Most of the time, this is not a problem but you want to be alert to swelling of the brass directly ahead of the web.   

I had one just like yours quite a few years ago and was told that the importer "improved" a very large batch of Danish RB's by touching up the chamber with a .45-70 reamer.  My rifle was pretty, but not particularly accurate.

JackHughs
  
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