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Double Rifles, Single Shots & Combinations >> Double Rifles
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Huvius
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Reged: 04/11/07
Posts: 3556
Loc: Colorado
Firing Order Effect On Regulation?
      #185769 - 14/07/11 03:42 AM

The discussion on scoping a double rifle and the suggestion of perhaps using a lightweight red-dot sight has brought a question to mind which I think could start an interesting and helpful new discussion.

We all accept that scoping a double can have an effect on regulation, right?
What do those in the know think is happening here? My guess is an alteration of harmonics is the culprit.
How makers can regulate a double for open and scoped use is a mystery to me, but it has been and is done and could be a separate discussion of its own.

Now, to my question at hand.
My feeling is that a superlight red-dot sight mounted near the breech would have no discernable effect on regulation.
My reasoning lies in the assumption that a bigbore double would be regulated shooting right/left. The left being fired with an empty shell in the right chamber.
Would the same rifle not regulate quite as well if shot left/right?
Would a sight weighing in at an ounce or two have any more effect on regulation as having one empty chamber?

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He who lives in the past is doomed to enjoy it.

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DarylS
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Reged: 10/08/05
Posts: 26998
Loc: Beautiful British Columbia, Ca...
Re: Firing Order Effect On Regulation? [Re: Huvius]
      #185800 - 14/07/11 12:22 PM

Interesting - as the sight is central, it has only 1/2 it's weight attached to each tube.

--------------------
Daryl


"a gun without hammers is like a Spaniel without ears" King George V

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baileybradshaw
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Reged: 21/06/08
Posts: 305
Loc: Diana, TX
Re: Firing Order Effect On Regulation? [Re: DarylS]
      #185802 - 14/07/11 12:45 PM

Don't overcomplicate regulation. It has more to do with the amount and direction the rifle moves from recoil while the bullet travels down the barrel. The faster the velocity of the bullet, the less effect adding a scope or other weight will have.

That being said, the balance point and amount of central mass makes a difference too. Two rifles weighing the same, same caliber, but one with more barrel weight, the other with better balance. The barrel heavy rifle will require more spread at the muzzel. The barrel weight will decrease rise and tourque. The more balanced rifle will rise and tourque more, therfore the muzzles will need to be closer together to compensate for this.

It's not harmonics that effect regulation as much as how much weight the rifle has and where it is in relation to the chambers. Weight behind the source of recoil ( the cartridge) will have less effect supressing rise and tourque, where weight in front of the chamber will have more effect. The reason is the sability of the push vs. pull effect. It's easier to pull a weight in a straight line than it is to push the same weight.

What makes it all so much fun ( tounge in cheek here) is that every rifle is different. Thay may act similar, but never exatly the same.

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www.bradshawgunandrifle.com

Edited by baileybradshaw (14/07/11 12:47 PM)

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herrdoktor
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Reged: 03/08/07
Posts: 85
Loc: Spain
Re: Firing Order Effect On Regulation? [Re: baileybradshaw]
      #186075 - 19/07/11 04:47 AM

Hello, Huvius:
Certainly, the weight of the rifle and the barrels have a greater effect over regulation than harmonics, and I agree with you that the weight of my Leupold Deltapoint, a little over half an ounce will have a negligible effect over regulation. I think harmonics have a bigger role in the size of the groups of each barrel...
But There is another fact in regulation you mention, and it is the way the heat of the barrel you shoot first affects the other barrel. I do not know exactly the dynamics of heat trnasfer and dilatation and/or "deformation" of the second barrel. But I can tell you that in my 450 there is a clear effect: the rifle shoots different if you fire the left barrel first, regarding both regulation and point of impact.

Herrdoktor

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