12 gauge chamber inserts...

[TripleF]

The adaptor could be two part. Unscrew the base, insert cartridge and screw it back on. That provides the support. The base contains spring loaded firing pin.

I thought of that myself as well, unfortunately this would add unnecessary complexity (added parts and close tolerances) as well as added manufacturing costs which would have to translate to the product price or face low margins or lower mass interest if price were to be 'too high'. Plus, I don't think it would be too fun having to spend 30 seconds loading/unloading each cartrige/casing from a closed adapter.

 

[TripleF]

I think this would also happen in the adapter, as the pressure would force the case walls against the adapter. Even at its thickest point just at the case web a .308 case can only withstand about 4000 pounds of pressure before the case head fails and wants to blow out of of the insert, leaving the shotgun action with the job of holding back the remaining 5200lbs. If the action can handle 5200lbs things are golden, but if it isn't strong enough to take that 5200lb force and it fails, the full 9200lb of force from the gasses will be unleashed on the bolt face

here's a simple but very good image...
http://s2.photobucket.com/user/briansmithwins/media/excessheadspace.jpg.html

A picture (with some text) tells a thousand words - good one.

 

[Darkw]

I found an outfit in Germany called Keppeler that makes some pretty beefy inserts:

Insert barrels universalize and round off the range of use of break-action firearms. Keppeler insert barrels are made of first-class, partly stainless steel and stand out due to its perfect workmanship. The insert barrels are up to 72 cm long, full length, and flush-to-muzzle. They can be inserted and removed easily without the need of any tools while the point-of-impact does not change.



The patented Keppeler adjustment VVV was tested by the DEVA (German Institute for Testing Hunting and Sporting Firearms). Perfect precision and excellent performance when shooting multiple rounds heating up the barrel have been proven.

Point-of-impact does not change when inserting or removing the barrel

Adjustments of the insert barrel are possible without removing it: Due to four adjustment screws at the muzzle the insert barrel can be adjusted quickly and easily to the desired point-of-impact.

No adjustments of the choke are necessary when fitting the insert barrel to the gun.

Highest material and corrosion resistance ensure a long lifetime.

No fouling of the shotgun barrel because the insert barrel seals the shotgun barrel completely.

Fullbore insert barrels are only suitable for over-and-under rifles with an accordingly strong action (cal. 12/16/20).







Stainless insert barrels with barrel lengths up to 650 mm:

Insert Barrel Caliber Gauge
.17 HMR 12/16/20
.22 lfB 12/16/20
.22 WMR 12/16/20
.22 Hornet 12/16/20
.22 Hornet superlight 12/16
.222 Remington 12/16/20
.223 Remington 12/16/20
.204 Ruger 12/16/20
5,6 x 50 R Magnum 12/16/20
5,6 x 52 R Savage 12/16/20
6 x 52 Bretschneider 12/16/20
6 x 70 12/16/20
Fullbore insert barrels with barrel lengths up to 650 mm
(only suitable for over-and-under rifles with an accordingly strong action):



Further calibers and overlength insert barrels up to 720 mm are available on request.

We recommend conferring with us or your dealer before inserting an insert barrel bigger than .22 Hornet in break-action firearms, especially drillings of older age, to prevent your firearm from damages through overstraining the action.

Insert Barrel Caliber
Gauge
30-30
12/16/20
6,5 x 57 R
12/16/20
6,5 x 65 R
12/16/20
7 x 57 R
12/16/20
7 x 65 R
12/16/20
.30 R Blaser
12/16/20
8 x 57 IRS
12/16/20
9,3 x 72 R
12/16/20
30-06
12/16/20
.308 Winchester
12/16/20
.243 Winchester
12/16/20
.270 Winchester
12/16
.8 x 57 IR
12/16/20
9,3 x 74 IR
12

 

[Darkw]

I've noticed that at least one manufacturer leaves an un-rifled section of barrel a couple inches in front of the chamber in order to allow rapid acceleration of the bullet before it hits the resistance of the rifling. This apparently helps to reduce maximum pressure.

 

[hisnibs]

I've noticed that at least one manufacturer leaves an un-rifled section of barrel a couple inches in front of the chamber in order to allow rapid acceleration of the bullet before it hits the resistance of the rifling. This apparently helps to reduce maximum pressure.

Silly question but wouldn't that negatively impact accuracy in a major way?

 

[Darkw]

I've noticed that at least one manufacturer leaves an un-rifled section of barrel a couple inches in front of the chamber in order to allow rapid acceleration of the bullet before it hits the resistance of the rifling. This apparently helps to reduce maximum pressure.

Silly question but wouldn't that negatively impact accuracy in a major way?

I suppose the bullet would have less exposure to the rifling, and so might be less stable. But then again this is done to avoid case rupture, and that is not good for accuracy either!

 

[howard2]

I'm still looking for a adapter that I can shoot 7.62 x 39 in my old sporterized P14 .303, both have a .311 bore

 

[0mega Alpha]

I'd be in for the pistol calibers. I've got some pretty nice rifles for the rifle cartridges. I like my shotguns but those 6-10 dime shotshells are pricey. A 9mm or 40 cal adapter would be the mutts nuts.

 

[pat-boon]

so after all this time,,,,has anyone decided if canada ammo will have them for sale this year or not? i def want some adapters for my SxS 12 gauge,,,,.22 & 7.62x39 & 38/357 lol i got the ammo, and no longer have the guns to fire them,,,,im left with my 12ga SxS, one mosin nagant, and a .22 lol

 

[TripleF]

Would be nice to see them, but I think CanAm has other priorities, at the moment. Although some feedback would be nice.

 

[hisnibs]

Not sure shotgun breech would be strong enough for 7.62x39. Some about pressure on breech face being over spec for shotgun shells I think.

 

[shotgun-bob]

Too much pressure DOES NOT work...these are fun...as long as sniper rifle is not expected

 

[fat tony]

People have experienced pierced primers with certain shotguns where they used inserts. Some shotguns (such as Cooeys) have large firing pins. It could easily become a liability issue. Think about gas from a ruptured 7.62X39 case blowing back through the firing pin hole on a Cooey shotgun. The hole is angled up towards the shooters face.

 

[geologist]

I have adaptors for .22 LR and .357 Magnum.

The .22LR keyholes at 25 yards so it's so so.

The .357 magnum shoots about 4" at 25 yards with the right barrel.

I also have 12 ga adaptors for those pen style flares and bear bangers.

 

[fat tony]

Great rig! If wanted to shoot 7.62X39mm through a subcalibre adapter, I would choose a shotgun such as an IJ-18. Mainly because the receivers are the same, if I am not mistaken, as used on the IJ-18 centrefire rifles (30-06, 7.62X54r), etc.

Maybe someone from Baikal Canada can chime in on that score.

 

[jacob.22]

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[K-Roc]

.22 inserts would be great... looked into buying one and it was going to come to $150 after exchange, taxes, and shipping... no thanks.

As for a bolt action in 7.63X39 I can only think that would be a huge winner, but I have asked a few places and sadly it seems they are not on the horizon anywhere eh?

 

[jmichelin84]

I'd love to find something for my 410 crack barrel, like a 22 Lr or 45 amp, something that might fly good thru it

 

[Johnyy]

MY gf found me a 12 to 410 last xmas..they also had 12 to 20 as well, for $20! But havent found any others. Id also def. buy Pistol caliber inserts.. & You can get a 26.5mm to 12 g then from there, simply use any 12 g insert, so you dont necessarily need 26.5mm inserts.

 

[Johnyy]

Is it legal to make your own inserts? Seems it would be.