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NitroX
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Reged: 25/12/02
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Advice/comments on regulation for a new custom DR
#233213 - 30/07/13 11:45 PM

I am looking to have a DR made in .375 Flanged Magnum.

Some comments. It is planned to use this rifle for a lot of different hunting. Buffalo, elephant, etc, plus larger plains game. Deer, pigs, boar, moose etc etc.

As such open sights won't do all that is required. In some form or other the rifle will be used for some longer ranged shooting. By this I mean realistic ranges, 200 metres, maybe 300 metres. At the longer ranges even if only one barrel cuts it.

The scope will be something like a 1-4x, S&B, Zeiss, Swarovski, or similar.

While maybe superfluous I would like a Docter dot point option as well ...

I have been asked to specify the regulation required.

One scenario (recommended):
- regulate the barrels with the primary sight being the scope. A inch apart at 100 metres.
- without the scope fitted, it was mentioned the open sights will shoot about 25 mm's crossing at 50 metres.

Second scenario:
- regulate the barrels for the express sights, an inch apart approx at 100 m.
- with the scope fitted, the shots will be several inches apart at 100 metres.

Dot point sight:
- it was mentioned the dot point sight will also act somewhat like a scope in terms of its effect on regulation.
- my comment - perhaps less so, as it would be lighter?

Third scenario:
My comments only.
- IF the dot point sight affects the regulation similar to the scope in actual practice, it could be an alternative to the open sights, when the scope is not desired.

***

My initial preference was the second option. ie the express sights the most reliable option. Use the scope, sighted in for one barrel, try it out in actual practice to see how it performs.

My new preference is the first option. I will almost certainly use the scope most of the time for most of my hunting. If the scope is removed, 50 metres and crossing slightly won't be a big impediment for close shooting with a scope removed.

Try out the dot point sight and see how it performs.

***

Comments appreciated.

--------------------
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"

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gungadoug
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Reged: 13/08/12
Posts: 285
Loc: NM

Re: Advice/comments on regulation for a new custom DR [Re: NitroX]
#233216 - 31/07/13 12:26 AM

I have a double in 8x57jr, with a claw mounted scope. It regulates at 50m with iron, and 100m with the scope, with the same loads!
Doug

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NitroX
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Reged: 25/12/02
Posts: 39883
Loc: Barossa Valley, South Australi...

Re: Advice/comments on regulation for a new custom DR [Re: gungadoug]
#234721 - 26/08/13 01:31 PM

Thanks Doug. Did not see your reply until now.

How does your rifle shoot/regulate with iron sights at 100 metres. I assume the barrels have crossed?

Anyone else have any comments? Thanks.

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

...
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"I love the smell of cordite in the morning."
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alexbeer
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Reged: 10/04/08
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Loc: Tasmania, Australia

Re: Advice/comments on regulation for a new custom DR [Re: NitroX]
#234771 - 27/08/13 12:33 PM

Hello Nitrox

When I fitted the 4x Zeiss and claw mounts to my 9.3x74R double, it would not regulate with the scope. Cannot remember exactly how it changed but it used to shoot into about 2-1/2 to 3” (2x right-lefts) at 100 yards with the open sights, but when the scope was added it did not shoot to an acceptable standard at all, like around 5 inches.

I re-regulated the barrels (heat and move etc) using the scope at 100 yards. Now it shoots around 2” groups (2x right-lefts) scoped at 100 yards and (when my eyes are up to it) just a tad over 1” with the open sights at 50 yards….. More than adequate. I think have some pictures of the groups somewhere, I’ll try to find them and post them.

Found them

With the open express sights @ 50 yards (and yes there are 4 shots there, 3 in one hole)

and with the 4x Zeiss @ 100 yards

I don’t have any targets to back this up, but when I can see well enough, my 9.3 double will comfortably hold four shots into about 2-1/2 to 3” (2x right-lefts) at 100 yards with the open sights. For me I would consider that excellent field accuracy. When I do my part, it has killed everything I've shot it at at those sorts of ranges.

If it were me, and considering the wonderful caliber you have chosen, and considering you are going to scope sight the rifle, then I'd get the rifle regulated at 100 yards with the scope sight, and have the open sights zeroed to 75 yards. You wouldn't have to worry about trajectory over normal open sight ranges and you can zero the scope sight to what ever distance you wish.

And don’t forget, express sights really aren't the best suited to head shooting rabbits at 100 yards anyway

Best
ALEX

--------------------

Details matter!

Edited by CptCurl (28/09/13 11:41 PM)

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NitroX
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Reged: 25/12/02
Posts: 39883
Loc: Barossa Valley, South Australi...

Re: Advice/comments on regulation for a new custom DR [Re: alexbeer]
#234794 - 28/08/13 09:15 AM

Thanks for the comments Alex.

Now that you have re-regulated your rifle for the scope, I note your comments regarding how the open sights now shoot/regulate.

Quote:

With the open express sights @ 50 yards (and yes there are 4 shots there, 3 in one hole)

Quote:

and with the 4x Zeiss @ 100 yards

I'm guessing the open sights haven't crossed yet at 50 yards. What do they do after 50 yards and before 100 yards? Have they crossed by then?

I think your regulation is a good result. Regulated for the scope at 100 yards, but the open sights are usable for good results still at 50 yards and probably still OK at 100 yards.

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

...
Govt get out of our lives NOW!
"I love the smell of cordite in the morning."
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Chasseur
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Reged: 18/11/03
Posts: 771
Loc: Hunting classic Indian game!

Re: Advice/comments on regulation for a new custom DR [Re: NitroX]
#234798 - 28/08/13 12:39 PM

I've messed around for several years with a scoped 9.3, and I've borrowed a few double rifles for driven game hunts with red dot or similar sights.

Realistically for what you are talking baout I'd go with a scope regulated 375, get one of illuminated reticle scopes and do all what you want to do with one scope. For close range fast shooting the illuminated reticle scopes work as well as the traditional red dots. Then you have the flexibility of having magnification for longer range. I used a double rifle drilling with one of the illuminated Swarowski Z6s on a driven hunt and it was excellent.

Just a compromise thought.

--------------------
In regards to action he should devote himself to hunting...
-Machiavelli

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NitroX
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Loc: Barossa Valley, South Australi...

Re: Advice/comments on regulation for a new custom DR [Re: Chasseur]
#234806 - 28/08/13 07:56 PM

Quote:

I used a double rifle drilling with one of the illuminated Swarowski Z6s on a driven hunt and it was excellent.

So you use the Z6 scope for the shotgun barrels on the drilling as well? How does it go? Any problems with eye relief/bumps on the scope?

--------------------
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"

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gungadoug
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Re: Advice/comments on regulation for a new custom DR [Re: NitroX]
#234810 - 29/08/13 12:31 AM

Nitrox, the barrels shoot for all practical purposes parallel. Groups at 50 run 2" with irons, and about the same at 100 with the scope.
Doug

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Chasseur
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Reged: 18/11/03
Posts: 771
Loc: Hunting classic Indian game!

Re: Advice/comments on regulation for a new custom DR [Re: NitroX]
#234819 - 29/08/13 04:02 AM

Quote:

Quote:

I used a double rifle drilling with one of the illuminated Swarowski Z6s on a driven hunt and it was excellent.

So you use the Z6 scope for the shotgun barrels on the drilling as well? How does it go? Any problems with eye relief/bumps on the scope?

This was on a double rifle drilling I used once. So its was a big game hunt so I was only using the two rifle barrels (just like any other double rifle), didn't use the shotgun barrel. Eye relief was fine with the scope and the 9.3. Swarovskis tend to have good eye relief.

--------------------
In regards to action he should devote himself to hunting...
-Machiavelli

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doubleriflejack
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Reged: 11/11/07
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Loc: Oregon, U.S.A.

Re: Advice/comments on regulation for a new custom DR [Re: NitroX]
#234823 - 29/08/13 05:19 AM

Nitrox: "I'm guessing the open sights haven't crossed yet at 50 yards. What do they do after 50 yards and before 100 yards? Have they crossed by then?"

A properly well regulated double rifle's bullets will never cross, but will shoot parallel to infinity, within reasonable range for caliber. Some guys are under the misconception that a double rifle should cross, usually at range rifle was regulated for--50 yards, 75 yards, whatever, but that is simply not true.

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NitroX
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Re: Advice/comments on regulation for a new custom DR [Re: doubleriflejack]
#234905 - 31/08/13 03:54 AM

I've already stated that if the rifle is properly regulated for a scope, the difference will result in the rifle crossing using open sights. Therefore a compromise is the result of using both open sights and a rifle setup primarily for scope use.

--------------------
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"

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