How much improvement in accuracy should I expect if I fit rifled choke tubes to my drilling.

Thanks in advance.

mike

But why?

Is it for slugs or brenneke that you whant more accuracy?

One shot note that drillings are not suited to shoot saboted slugs or other derivates as such.

Have you tried your right barrel with brennekes?

Doesn´t shoot to point of inpact to the rifle sights?

Barrel walls in a drilling are thin and I have a hard time beliving that there are any benefits of trying the adventure that you are suggesting.

Best regards Chris.

Point of impact isn't the issue I'm trying to address, I'm trying to reduce the group size. I want to increase the accuracy of a slug from the left barrel for the odd occasion a follow up shot is needed.

I'm interested in your comment that you can't use saboted slugs. Why is this.

I suspect that the thickness of barrel walls varies between manufacturers - the light weight Franz Sodias with the aluminium receiver are designed to weigh seven pounds and I imagine have lighter barrels than an eight pound plus Merkel.

Thanks for your comments.

mike

Hi Mike!

God call on the reason why.

My blunt statement regarding saboted slugs and other more exotic version stems from known swedish gunsmith that when asked said that the barrels and the soldering have issues with the harder saboted slugs ie there is likeness to the ideas about monoliths in doubles.

Most drillings are just made to make the right hand barrel shoot poi with the rifled barrel.

At what distance are you shooting and with what result?

A rifled choke might shift the poi but so can an adjustement of the fixed choke as well, there are gunsmiths here in Sweden that will help you with your shotgun if it doesn´t pattern properly, they will adjust the chokes to shift the poi.

couldn´t that be done to your drilling instead?

Best regards Chris.

Husqvarna98, thanks for the input. In Australia it is virtually impossible to get Brennekes and has been so for the last 5 years. All we can get are Fosters slugs and, occasionally, Winchester Supreme saboted slugs. The Fosters group about 125mm at 25m and I hope, by using a rifled choke tube, to decrease the group size to 50mm or less.

The drilling is used to hunt sambar deer in thick forest where the first shot is usually taken at less than 50m with the rifle barrel (9.3x74R) and the second shot, if needed, at less than 80m. If I can get 8moa then the slugs can be used out to this range.

mike

Try Fisher Firearms in Adelaide, they had plenty of RWS Brennekes (12g) last time I was there in September.
Failing that, Brierly did list a rifled "paradox" choke tube, I don't know if they still do. Mialls gunshop should be able to tell you. Be careful though, the tubes are rifled in such a way as to tighten as the slug passes though them, and should be backed off and reseated after a few shots. That was the advice I got from the installer, anyhow. Sounds like a good idea.

No success at Fisher Firearms. I rang today.

I'm going to try the Briley tubes. I'll let everyone know how it goes.

Thanks for the info.

mike

Hi Mike!

Please do update us as the project unfolds..

Best regards Chris

i think the swedish gunsmiths better rethink their condemnation of sabots in drillings.

they are -not - the same as monolithic solids !

there is this clever little compressable plastic
sabot that surrounds the slug. no way it will ever touch the barrel walls.

i suspect it is this kind of thinking that is why sweden is not known as a real gunmaking country.

I'm playing with the same idea in a single barrel. Carlson's and Colonial Chokes make rifled chokes that extend beyong the barrel. There are several diameters of choke, and the best suited for thin barrels is the tru-choke system which is .795 x 44 and needs a minimum of .825 barrel thickness to cut the thread. Bob

OK, I hope you realise the fact that here i Sweden we frequently have drillings that are 100+ years old, they are delicate when compared to the iron work horses of drillings from this century.

That might very well be the origin and reason for the cautious advice of swedish gunsmiths.

That said I would never shoot saboted slugs due to the fact that my drilling was made to have the Brennekes from the right barrel hit poi with the rifled barrel.

Yeah right, ever heard of Husqvarna?

There are quite a few really good Swedish gun smiths however it´s a long way ower there and I really have to question your knowledge of the matter at hand and your tone.

Why dont you feast your eyes at the rifles on this link a sample of what is being made here in Sweden.

http://www.vovapen.com/productsndesign.php


Best regards Chris.

quote:

Originally posted by tomo577:
i think the swedish gunsmiths better rethink their condemnation of sabots in drillings.

they are -not - the same as monolithic solids !

there is this clever little compressable plastic
sabot that surrounds the slug. no way it will ever touch the barrel walls.

i suspect it is this kind of thinking that is why sweden is not known as a real gunmaking country.

This is a straight Quote from Foxfire..

/C

sent an E-mail to Brenneke asking this specific question. I told them when the rifle sights are up on my drilling the left barrel of the shotgun can also be fired. It has a full choke. Can I shoot slugs and which slugs can I use through a smooth bore full choke.
Here is their response.



"You can shoot all Brenneke slugs except the Super Sabot and the Gold Magnum out of any kind of choke. Full choke is not a problem for our slugs. The before mentioned slugs Super Sabot and Gold Magnum are for rifled barrels only and must not be shot from any kind of choked barrel."

quote:

sent an E-mail to Brenneke asking this specific question. I told them when the rifle sights are up on my drilling the left barrel of the shotgun can also be fired. It has a full choke. Can I shoot slugs and which slugs can I use through a smooth bore full choke.
Here is their response.



"You can shoot all Brenneke slugs except the Super Sabot and the Gold Magnum out of any kind of choke. Full choke is not a problem for our slugs. The before mentioned slugs Super Sabot and Gold Magnum are for rifled barrels only and must not be shot from any kind of choked barrel."

Interesting, so a rifled choke tube MAY be ok in a rifled choke gun if the rifled choke is bore diameter. I'm certainly not going to fire them in muy light weight Franz Sodia drilling with fixed chokes. I may give them a go in my Merkel.

mike

Keep in mind that if the choke tube is extended, it is possible to adjust the impact of the barrel by slightly shortening the side of the barrel on the side you want the impact to move towards. The old roundball doubles from the 1800's often had almost 1/8" shorter edges on the outer sides of the barrels, to correct crossfiring. Of course with foster type slugs, this much off the side of the barrel will make Brennekes hit sideways, and 8" off, from the tilting force of the uneven gas release. I had a Rossi 20 ga that did this with the left barrel, until I fixed it with a slight application of a flat file to square up the muzzle better. They must have used a belt sander at the factory to do the finish on it. Sounds weird, but it works-just go .01" at a time for testing.

Aussie Mike
Why not shoot the slug for the 50M shot and use the 9,3 for the 80M follow up??

Just a thought.

I've had briley rifled choke tubes fitted. Each barrel has gone from 4" groups at 25 yards to a single hole with Fosters slugs and with Winchester Supreme saboted slugs. The right barrel is spot on the sights while the left crosses about 2" at 25 yards. I'm going to get a Lee 1oz slug mold and modify it on the lathe to increase the weight to 1 1/4oz. I simply cannot find any 1 1/4oz factory loads in Australia.

mike

Good to hear it worked out OK.

I AGREE WITH 450 #2

THINGS MUST BE BACKWARD OR UPSIDE DOWN, DOWN UNDER.

THE RIFLED SLUG IS TO BE USED AT 50M

THE RIFLE 9,3 AT GREATER DISTANCES.

SO NOW MIKE YOU DON'T HAVE TO START RELOADING & MAKING SPECIAL SLUGS TO BOOT. TRY THIS OUT , OK.

Even better, use a mod choke and 00 buck in the left bbrl for running shots out 30 M, the right with slug to 50 M, and the 9.3 after that. Just gotta remember which trigger is which!