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Double Rifles, Single Shots & Combinations >> Double Rifles

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AkMike
.416 member


Reged: 19/11/05
Posts: 2576
Loc: Anchorage, Alaska
Scoping a DR
      #228076 - 05/04/13 04:55 AM

I had a Talley rib added to my Searcy 450 NE. Now that it's back and before I head to the range I want to bore sight it to get it close. BUT with the barrel convergence,,,, Where do I set it?
I have it dialed in close on the LH tube but the right one is way off. Should I split the difference and call it good?

It's now wearing a Leupold 1.5 to 5 20mm with a Burris Fastfire II on a different mount.

--------------------
"When you see that in order to produce, you need to obtain permission from men who produce nothing; when you see that money is flowing to those who deal not in goods, but in favors; you may know that your society is doomed." Ayn Rand


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500Nitro
.450 member


Reged: 06/01/03
Posts: 7244
Loc: Victoria, Australia
Re: Scoping a DR [Re: AkMike]
      #228078 - 05/04/13 05:03 AM

Set it for one barrel.

Probably the right barrel unless you are
comfortable firing the left barrel first.

Start with one barrel and get the gun shooting
to where it is. This gives you something to
come back to if needed.

Then try getting it close to both barrels.


If necessary, try it set up for the other barrel
and see if it makes a difference.



Edited by 500Nitro (05/04/13 05:03 AM)


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AkMike
.416 member


Reged: 19/11/05
Posts: 2576
Loc: Anchorage, Alaska
Re: Scoping a DR [Re: 500Nitro]
      #228082 - 05/04/13 05:36 AM

I did set it for the LH tube already but the RH one is way off. I was thinking (scarey huh ) about how to try to get it closer.

--------------------
"When you see that in order to produce, you need to obtain permission from men who produce nothing; when you see that money is flowing to those who deal not in goods, but in favors; you may know that your society is doomed." Ayn Rand


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NitroXAdministrator
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Reged: 25/12/02
Posts: 39777
Loc: Barossa Valley, South Australi...
Re: Scoping a DR [Re: AkMike]
      #228083 - 05/04/13 06:08 AM

Quote:

I did set it for the LH tube already but the RH one is way off. I was thinking (scarey huh ) about how to try to get it closer.




Are you talking about bore sighting only or bullet impact?

If only bore sighting, you will need to shoot it and see where the first barrel is impacting. There will be no guarantee that both barrels will regulate with a scope and mounts, unless it was regulated for that specific scope and mounts.

Bore sighting alone will only be so good, as the barrels will move to an extent while the bullet is still travelling in the barrels. The regulation will have allowed for this movement.

Bore sight it as you have done. Shoot that barrel bore sighted. I would guess it will not be on at all, so adjust the scope to close to the impact as with a single barrel rifle with as many shots as it takes. Then try the second barrel. ie shoot one shot from the first barrel, then one from the second barrel, and see how the two rounds go together. You may be lucky.

When discussing this with the gunmakers who regulate rifles at Heym and Verney-Carron both said the rifle needs to be setup either for open sights OR a scope. Of course we know some guys are lucky and their rifles seem to handle both.

Searcy could re-regulate the rifle for your scope and mounts now installed if needed.

Also you could try different loads and see if that has any influence.

If you plan to use open sights still, but have a QD scope option for longer shots, and the rifle does not regulate with the scope, a lesser alternative would be to sight ONE barrel for the scope. At least you know the one barrel will be spot on.

--------------------
John aka NitroX

...
Govt get out of our lives NOW!
"I love the smell of cordite in the morning."
"A Sharp spear needs no polish"


Edited by NitroX (05/04/13 06:13 AM)


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AkMike
.416 member


Reged: 19/11/05
Posts: 2576
Loc: Anchorage, Alaska
Re: Scoping a DR [Re: NitroX]
      #228087 - 05/04/13 06:23 AM

Thanks John.
I do have it set for bore sighting now. I'll see what happens when I get to the range.
Searcy said very few of his rifles ever needed to be re-regulated for adding scopes. This and the red dot will aid my eyes as I get older.
I'll find out soon.

--------------------
"When you see that in order to produce, you need to obtain permission from men who produce nothing; when you see that money is flowing to those who deal not in goods, but in favors; you may know that your society is doomed." Ayn Rand


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500Nitro
.450 member


Reged: 06/01/03
Posts: 7244
Loc: Victoria, Australia
Re: Scoping a DR [Re: AkMike]
      #228089 - 05/04/13 06:39 AM


John

My understanding was a DR that was to be scoped
was regulated to the open sights and then the
scope was installed and set up for ONE barrel.

And as you say, some people are lucky.


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AkMike
.416 member


Reged: 19/11/05
Posts: 2576
Loc: Anchorage, Alaska
Re: Scoping a DR [Re: 500Nitro]
      #228090 - 05/04/13 06:42 AM

I'll give a report and add some pics of it.
If all else fails the red dot shouldn't affect the regulation. It weighs just a couple of ounces.

--------------------
"When you see that in order to produce, you need to obtain permission from men who produce nothing; when you see that money is flowing to those who deal not in goods, but in favors; you may know that your society is doomed." Ayn Rand


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hoosier
.224 member


Reged: 11/07/11
Posts: 32
Loc: Indiana,USA
Re: Scoping a DR [Re: AkMike]
      #228149 - 06/04/13 03:17 AM

I scoped my rifle a year or so ago with a mount that I made.The first one didn't work out-made of steel. the next one is aluminum and cut as low as a hammer gun will allow for clearance with low rings. It seems that the lower and lighter the better on my rifle. The regulating load had to be tweaked as well.Started shooting at 25 yards to see where it was at and went from there.The load had to be slowed down a bit but worked out real well-now sighted at 100 yards & well regulated.Nice to see
my target again. Good luck with yours.

--------------------
BigMike


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gungadoug
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Reged: 13/08/12
Posts: 285
Loc: NM
Re: Scoping a DR [Re: hoosier]
      #228163 - 06/04/13 09:26 AM

I have a nice German made- don't recall the name- double in 8x57jr, with the original claw mt scope. It will regulate fine with both the iron sights and the scope with the same load! Likely this is not the norm, but certainly is possible! BTW the load I am using, due to the difficulty of getting 220 gr bullets, is a lighter bullet at a reduced velocity. This may or may not have any bearing on the situation, but indicates you may need to work on loads?
Enjoy! Doug


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CptCurlAdministrator
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Reged: 01/05/04
Posts: 5284
Loc: Fincastle, Botetourt County, V...
Re: Scoping a DR [Re: gungadoug]
      #228180 - 06/04/13 10:37 PM



Curl

--------------------
RoscoeStephenson.com

YOUR DOUBLE RIFLE IS YOUR BEST FRIEND.



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Rell
.375 member


Reged: 03/12/04
Posts: 642
Loc: Oyster Bay, NY, USA
Re: Scoping a DR [Re: CptCurl]
      #230173 - 17/05/13 08:21 AM

I have a 450-400 Chapuis with a Leupold vx6 1-6x in Chapuis pivot mounts.

It's pretty well regulated withe irons at fifty but the scope actual does better at 100 y. I was thinking of getting it dialed in with softs with one barrel and trying different solid loads with the other until it's decent. Is this valid or nuts?

--------------------
450-400, 9.3x74r and 7x65r.


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500Nitro
.450 member


Reged: 06/01/03
Posts: 7244
Loc: Victoria, Australia
Re: Scoping a DR [Re: Rell]
      #230175 - 17/05/13 08:34 AM


rell

The question I have is how often do you really need solids ?

Better to get it regulated with softs for both barrels.

The use one barrel for solids if needed.


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Rell
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Reged: 03/12/04
Posts: 642
Loc: Oyster Bay, NY, USA
Re: Scoping a DR [Re: 500Nitro]
      #230347 - 22/05/13 05:25 AM

I plan on hunting black bears as large as 175 lbs.

Need solids got that!

--------------------
450-400, 9.3x74r and 7x65r.


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AkMike
.416 member


Reged: 19/11/05
Posts: 2576
Loc: Anchorage, Alaska
Re: Scoping a DR [Re: Rell]
      #230357 - 22/05/13 01:57 PM

LMAO!

--------------------
"When you see that in order to produce, you need to obtain permission from men who produce nothing; when you see that money is flowing to those who deal not in goods, but in favors; you may know that your society is doomed." Ayn Rand


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Birdhunter50
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Reged: 03/06/07
Posts: 815
Loc: Iowa,U.S.A.
Re: Scoping a DR [Re: AkMike]
      #230627 - 28/05/13 09:40 PM

Mike, How far off is it? If it is minute of Wolf at 50 to 75 yadrs by splitting the difference, I would just leave it alone. If it were mine and I wasn't going to re-regulate it, I would set the scope in for 100 yards using the left barrel and then shoot the right barrel first. If it is off very far, you will either have to put on some "Kentucky Windage" on the right barrel or try to experiment with your loads to see if you can get it to come together in the middle. Is it crossing the shots or spreading them from each other? If none of this is satisfactory, you get to have the pleasure of re-regulating it. Bob

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