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Double Rifles, Single Shots & Combinations >> Double Rifles
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foxfire
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Reged: 25/11/04
Posts: 511
Loc: Long Island N.Y.,
What can be done about the vertical spread?
      #26875 - 26/02/05 07:21 AM

I read the different things that can be done regarding bullets crossing and regulating the barrels by varying the speed of the bullets. i.e. Increase the speed to uncross, lower the speed to move together.

But, can anything be done if the right and left barrel are shooting 1"-1.5" apart vertically?

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DUGABOY1
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Reged: 02/02/03
Posts: 1340
Loc: TEXAS USA
Re: What can be done about the vertical spread? [Re: foxfire]
      #26948 - 27/02/05 07:18 AM

In reply to:

I read the different things that can be done regarding bullets crossing and regulating the barrels by varying the speed of the bullets. i.e. Increase the speed to uncross, lower the speed to move together.

But, can anything be done if the right and left barrel are shooting 1"-1.5" apart vertically?



FOXFIRE, this is common with older double rifles that have been used quite a lot. It is usually the result of wear in the right barrel. The right barrel being the first barrel fired, gets more use than the left barrel. Many of the shots taken on game with the right barrel are all that is needed, so the left barrel is not fired.

The example of 1" to 1.5 " apart is not enough to worry about if this is at 50 yds or farther, as long as you are aware of the placement of each barrel. At close range, like under ten yds you will probably not notice the difference between the barrels. Under ten yds, is where they must absolutely hit the same place! 1" to 1.5" @ 50 yds is tighter than most people can hold, under hunting conditions, and if it is a 100 yds, it is not a problem that needs fixing! The only real fix for the verticle spread caused by wear, is rebarreling, and 1.5" is not a problem, I'd worry about.

I would predict the right barrel shoots the highest, because of less resistance from the bore, causeing it to not develope enough pressure, hense less speed. One thing you can do with this rifle, if it bothers you when hunting dangerous game is to reverce the shot sequince, because I would bet the left barrel is shooting closer to the sights. By reversing the shot sequince and shooting the left barrel first, the first shot will likely be spot on, and if a charge insues, the closer the Buffalo/ele gets, the closer the right barrel will be to the sights. The left barrel will give more velocity, as well, at longer range, and off the end of the rifle, the right barrel will be closer to the sights. I'd find out, however, on paper before hunting a mad lion, if I were you!

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..........Mac >>>===(x)===>
DUGABOY1, and MacD37 founding member of DRSS www.doublerifleshooterssociety.com
"If I die today, I have had a life well spent, for I've been to see the Elephant, and smelled the smoke of Africa!"

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DUGABOY1
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Reged: 02/02/03
Posts: 1340
Loc: TEXAS USA
Re: What can be done about the vertical spread? [Re: foxfire]
      #26949 - 27/02/05 07:53 AM

FOXFIRE, I just read your post on the multi barrel sets string, and now realize you are shooting a rifle that was converted from right hand to left hand. With that in mind, were the triggers reversed as well? Also are you fireing the left barrel first? And finally, are you resting the rifle dirrectly on the sand bags or are you holding it in your hands as you would when shooting off hand?

These questions are important, because, the fireing of a right handed rifle with the left barrel first, will sometimes destroy regulation. A double rifle resting on anything other than you hand, and shoulder will not show proper regulation. A double rifle absolutely must be allowed to recoil as if you were shooting off hand, because the recoil arc is what determines the point of empact on the target for a given bullet speed. Some times, the re-stocking of a right handed double to left hand will require re-regulateing as well. Still, the difference between the POE between the barrels is not enough to worry about for hunting, if the group is at 50 yds or more. However, if I understood your post in the other string, you were shooting at 25yds, that is a zebra of a different stripe. you need to try your rifle at 50, and 100 yds befor doing anything else! Try a 4 shot group from cool barrels, with a rt,lft,rt,lft, and plot each shot as to where they hit the target, then see what the composit group is! If this composit group is under 3", and is on the sights it is shooting fine. A little judicious load work may tighten this up some, but 3" is fine for hunting. That is about as close a most of us can hold, off hand!

--------------------
..........Mac >>>===(x)===>
DUGABOY1, and MacD37 founding member of DRSS www.doublerifleshooterssociety.com
"If I die today, I have had a life well spent, for I've been to see the Elephant, and smelled the smoke of Africa!"

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NE450No2
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Reged: 10/01/03
Posts: 942
Re: What can be done about the vertical spread? [Re: DUGABOY1]
      #26950 - 27/02/05 09:42 AM

Foxfire,
What Dougaboy said.... dito.

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foxfire
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Reged: 25/11/04
Posts: 511
Loc: Long Island N.Y.,
Re: What can be done about the vertical spread? [Re: DUGABOY1]
      #26954 - 27/02/05 12:57 PM

Mac,
Thanks for all the information. To answer some questions: The gun was restocked left handed. The barrels still fire right barrel first (front trigger) then left barrel (rear trigger).

The 470 set of barrels are dead on as they were, regulated at 50 yards. My shooting and the targets included were identical. The 9.3x74R is a tack driver at 100 yards 6 shots total r,l,r,l,r,l the right barrel has three touching and so does the left about .5" apart vertically.

The barrel set in question is the 7x65R. At 25 yards my first time shooting the bullets were crossing. In the second session at 100 yards the left barrel crossed the right barrel by about 4". I turned the adjustable wedge and they came apart and are directly over & under each other at 100 yards. I don't seem to think the gun is giving what I'm expecting out of this caliber. After a 10 shot string. r,l,r,l etc. the right barrel put 5 round in 1" and the left barrel put 5 rounds in an inch.

The question came as the two barrels were 1"-1.5" apart vertically. The right barrel shot high and the left barrel shot low at 100 yards. I think this is fine for hunting. But I was wondering what effect different bullets and speeds had on the vertical separation.

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