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Double Rifles, Single Shots & Combinations >> Building Double Rifles & Gunsmithing

Marrakai
.416 member

Reged: 09/01/03
Posts: 3494
Loc: Darwin, Top End of Australia

Re: Barrels crossing?
18/05/08 08:06 PM

The point most people miss is that the barrels do not converge 'straight'.

The breech-ends of the barrels must be parallel, so that the chambers will be perpendicular to the breech-face. At some point forward of the chambers (usually forward of the forend loop), the barrels are bowed inwards slightly. The amount of convergence required for regulation depends on only the last inch of each barrel.

Placing a laser bore-sighter in the chambers tells you nothing. Placing them in the muzzles might give you some idea.

But remember, each pair of barrels on different rifles will be bowed together in a different curve, which is why the industry has used 'trial and error' regulation for over a century, rather than the impossible empirical solution you are seeking here.

Regulating a DR is usually a challenge, often frustrating, but always immensly satisfying. Just do it!

And BTW, I do have Ellis Brown's little 'Rule of Thumb' card sitting on my bookshelf...

...as a conversation piece!

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

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Subject	Posted by	Posted on
Barrels crossing?	450_366	06/05/08 06:22 AM
Re: Barrels crossing?	Judson	15/05/08 07:13 AM
Re: Barrels crossing?	450_366	15/05/08 07:35 AM
Re: Barrels crossing?	beleg2	15/05/08 08:52 AM
Re: Barrels crossing?	RSFknives	16/05/08 01:24 AM
Re: Barrels crossing?	dale	16/05/08 02:28 PM
Re: Barrels crossing?	450_366	17/05/08 05:20 AM
Re: Barrels crossing?	RSFknives	17/05/08 09:09 PM
Re: Barrels crossing?	450_366	18/05/08 06:04 AM
Re: Barrels crossing?	sakmyk	18/05/08 06:53 AM
Re: Barrels crossing?	Bramble	18/05/08 09:53 AM
Re: Barrels crossing?	RSFknives	18/05/08 11:05 AM
Re: Barrels crossing?	sakmyk	18/05/08 06:08 PM
Re: Barrels crossing?	Marrakai	18/05/08 08:06 PM
Re: Barrels crossing?	450_366	19/05/08 07:46 AM
Re: Barrels crossing?	Marrakai	19/05/08 01:38 PM
Re: Barrels crossing?	450_366	19/05/08 05:21 PM
Re: Barrels crossing?	DUGABOY1	22/05/08 03:22 AM
Re: Barrels crossing?	450_366	22/05/08 08:03 AM
Re: Barrels crossing?	DUGABOY1	22/05/08 11:19 AM
Re: Barrels crossing?	450_366	22/05/08 03:20 PM
Re: Barrels crossing?	4seventy	22/05/08 07:06 PM
Re: Barrels crossing?	450_366	23/05/08 12:28 AM
Re: Barrels crossing?	DUGABOY1	23/05/08 01:06 AM
Re: Barrels crossing?	450_366	23/05/08 07:53 AM
Re: Barrels crossing?	dale	22/05/08 05:24 PM
Re: Barrels crossing?	oupa	22/05/08 05:40 AM
Re: Barrels crossing?	sakmyk	19/05/08 04:16 PM
Re: Barrels crossing?	dale	19/05/08 05:09 PM
Re: Barrels crossing?	sakmyk	18/05/08 10:14 PM

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