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Double Rifles, Single Shots & Combinations >> Double Rifles
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herrdoktor
.275 member


Reged: 03/08/07
Posts: 85
Loc: Spain
over/under double regulation
      #116869 - 14/10/08 12:42 AM

Hello, all of you:
I need some help with my latest adquisition, a Franz Sodia in 8x60RS of 1958 vintage. I have no idea about bullet weight or speed and there are no indications anywhere in the rifle. I have tried 180 and 200 grains bullets and Tubal 5000, a medium powder similar in burning rate to IMR 4895, but even if I lower the powder charge, the rifle crosses the shots 4-5" at 25 meters. Estimated speeds are around 2300-2400fps, according to the reloading manuals. The groups are good with each barrel, one above the other. I have never tried to regulate one over/under double, and as the two barrels are above the rotation point of the weapon (on firing both barrels move upwards) I have not clear ideas of the effect of the usual changes on regulation.
Any ideas about bullet weights, speed or the loads used fifty years ago?
Any of you has experience with over/under regulation?

Thank you

Antonio Molins,
Madrid, Spain

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tinker
.416 member


Reged: 12/03/05
Posts: 4835
Loc: Nevada
Re: over/under double regulation [Re: herrdoktor]
      #116876 - 14/10/08 03:32 AM

Antonio-



How much crossing at 2400fps?
Does it cross more (further apart) with less powder?
Have you tried more powder/higher velocity than 2400fps?

It's possible your rifle wants more velocity.




--Tinker

--------------------
--Self-Appointed Colonel, DRSS--



"It IS a dangerous game, and so named for a reason, and you can't play from the keyboard. " --Some Old Texan...

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450_366
.400 member


Reged: 17/01/07
Posts: 1068
Loc: Sweden, west-coast.
Re: over/under double regulation [Re: tinker]
      #116879 - 14/10/08 04:34 AM

I usually get it mixed up, but wouldnt a 220 or 250grs bullet move the impact closer?

--------------------
Andreas

"Yeas it kicks like a mule he said, but always remember that its much worse standing on the other end"

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butchloc
.300 member


Reged: 18/12/04
Posts: 230
Loc: faribault mn
Re: over/under double regulation [Re: 450_366]
      #116954 - 15/10/08 07:44 AM

i really wish you luck. i had a sodia o/u in 300 h&h. beautiful rifle, except i never did get it shoot worth a hoot. i believe i tried something like 65 different loads and none worked. finally sold it

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beleg2
.375 member


Reged: 15/08/07
Posts: 591
Loc: Bahía Blanca - Argentina
Re: over/under double regulation [Re: butchloc]
      #116966 - 15/10/08 09:02 AM

Antonio,
Have you try lighter bullets.
If Im not wrong as fip and jump are n the same line on O/U you need to lower recoil or get less barrel time. JMHO
Martin

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ArnoldB
.300 member


Reged: 23/07/04
Posts: 139
Loc: Uk
Re: over/under double regulation [Re: beleg2]
      #116971 - 15/10/08 11:14 AM

If you can't get it to shoot with any ammo what is there to stop you from having the rifle re-regulated?

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4seventy
Sponsor


Reged: 07/05/03
Posts: 2210
Loc: Queensland Australia
Re: over/under double regulation [Re: herrdoktor]
      #117076 - 16/10/08 08:18 PM

Quote:

the rifle crosses the shots 4-5" at 25 meters. Estimated speeds are around 2300-2400fps



herrdoktor,
You really need to check that velocity with a chronograph.
Regulation of the O/U is done in a similar way to SxS.
I don't know anything about that particular cartridge but I'll see what I can find.

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André
.333 member


Reged: 28/06/04
Posts: 254
Loc: Brussels (Belgium)
Re: over/under double regulation [Re: 4seventy]
      #117081 - 17/10/08 01:44 AM

Anyhow, if your rifles crosses, you need a faster or lighter bullet.

--------------------
André
---------------------------------
3 shots do not make a group, they show a point of aim or impact.
5 shots are a group.

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farshot
.300 member


Reged: 25/01/06
Posts: 106
Loc: Alberta Canada
Re: over/under double regulation [Re: André]
      #117090 - 17/10/08 04:42 AM

I agree - 2400 appears to be a bit low for a 180 gr or even 200 gr 8x60S. I would try with a bullet lower then 180 gr first to get the speeds up and see if the bullet strikes begin to approach. If so then you have your answer. You can use lighter faster bullets or heavier and try to push them to a safe and reasonable velocity to see how close they approach. If a lighter bullet at say 2500 ft/s causes a greater cross over then als - you must go the other way.

1958 is not ancient. My 1962 vintage BRNO Super Express in 9.3 x 74 with 286 gr bullets at 2375 ft/s will always strike one over the other but about 2 inches apart (but not crossing). I know if I go to a lighter bullet the holes are closer, but 2 inches is nothing at effective ranges and I have used the rifle effectively for years this way.
I dont know if this helps, but with this rifle I cannot get the bullets to cross, light and fast or slow and fast or light and slow.....

My new BRNO 803 in 8x57 RS tho crosses right out of the box - while it can be adjusted , I am told that it is regulated for S&B 225 gr (Sierra bullets) which I have attempted to duplicate - I do see that the faster I get it (a lilttle over the S&B catelogue stated velocity), the closer the bullet strikes get, but I am pushing safety and have left well enough alone. So the crossover at 100 yds is about 1/2 inch with good solid safe loads. Given some time I am going to try the 200 gr Nosler Accubond to see how that works out.

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