I ordered my swede roller block in the 8mm caliber last week. Came home today and there it was in the carport. Felt like a kid at Christmas tearing open the box. Rifle was advertised as having an eexcellent bore (it did) and a very good stock. This one did also. What I origionally thought was rust on the action sides was actually dried up grease. The action is nice and tight, trigger pull was really nice and its origional date of burth was 1875. It had undergone conversion in 1892 as the stocks had the 1892 on them plus the serial number. All serial numbers match receiver, hammer, breechblock, and stock. Some of the origional case hardening is clearly visible. Was it worth the $450 I paid for it. Yes. Been giving some rather serious thought as to just what caliber I could convert it to. I recently lucked into a good deal on once fired winchester 30-30 brass. So maybe a rolling block with a green mountain octagon winchester style bbl chambered for the 30wcf.
Right now the bbl's bore is soaking with hoppe's and then the brushing begins. Si if anyone has some suggestions I'd be very much welcome.
Everything they said (simpson's) about condition was truthful and accurate. Regards, Frank

Trev, the ones that simpson's are selline are either Carl Gustav or Husquvarna manufacture. Since Carl Gustav is the state run armory it will have a Capital "C" with the swedish crown above it. The huski's are not run by the state so you may or may not find any indication as to who or when your rolling block was made. The carl gustavs will have the date along with the swedish crown. Earlier this evening had the buttstock off so as to be able to manuver the barrelled action for cleaning. Case colors were visible on the interior. The colors on the sides of the action were visible but not as much on the interior.
Frank

Trev, just another thought. The earlier actions were made with the sliding extractor like on your shotgun. When the conversions were done that screw hole was plugged and a different extractor which I believe (haven't had the action apart yet) rides on the same axel pin that the breechblock does. Maybe that could somehow help to date your action. Sure love the design of the buttstock on your shotgun though. Frank

Have been in contact with a couple different guys.

The general consensus is that the Shotgun started out as a Civvie  Husqvarna Model 12, and was likely restocked at some point. There is evidence of a couple spots being filled in, on the underside of the barrel, that would make me think it may have been a full-stocked gun at some point. As far as I understand things, the bayone lug would be on the side of the barrel, rather than underneath, so the small square with traces of brazing around it, could have been the remains of the forward lug for pinning the full stock in place,or... ?

Apparently the "N" marked breech blocks came on the scene about 1932. 
The overall condition of the metalwork makes me think that the breech block may be newer than the rest of it, but the makers were not as keen to mark the birthdate on the receivers, as were the military contract guns marked. I have been over the barrel carefully, and cannot find any markings other than the alignment notch in the center of the bottom flat, matching the one below the receiver ring on the front face of the action.

The inside of the barrel is in far better shape than I would have expected to find, given the state of decay on the outside. I have my suspicions that the barrel may have started life as a military rifle barrel that was bored out to shotgun size. The bore is considerably off center at the muzzle end.

There also seems to be a crack in the barrel at the breech end. I think this was the reason it was welded shut, as it would definately have been unsafe to continue shooting it.

The safety hammer was introduced in 1902, but there is no telling whether it was used on all the models produced from that point onwards, or if it was an optional extra.

From what I can gather, the Model 12 was in production until the late 1940's. I suppose the makers were on to a good thing, and there are few parts to go wrong, so it would have made sense to make them as long as they would sell.

I too am interested in seeing what there is to say about the pitfalls of the 8mm actions, as I was looking at a couple of them as possibles.

Gonna have to get my head around the fillers to use, as well as the appropriate prep to weld the groove full, that was filed into the top of the receiver, to be used, I suspect, as a rear sight for the shotgun. Too bad the breech block prevents it being seen when closed.

Cheers
  Trev

Put it in a can filled with kerosene, forget it's there for a month or two.

Use and old tooth brush while wet and have at it.

I like this for dirt and old grease and oil removal better than anything else I've ever tried. It just takes time to work.

Gentlemen, the Dutchman who has the web site full of info on swedish rolling blocks has posted a bit of good information on the castbullets@gunlods site. Just scroll down to the military rifles forum and you see his header. Good info. Hope this provide you with some info you may be looking for. Frank

Gents, I don't read swedish but the jist of the article was that the shooter had been using a 500 express cartridge. FRom the photos you could see that the right side of the receiver ring had parted company with the sidewall, left side showed cracks down to the breechblock pin.
Breechblock appears to have parted company from the rifle. and broken where the hole is for its retaining pin. The rifle in question was a husquvarna reworked rifle in the 12.7 x whatever the metric designation for case length. At least that's what I got from the article. Regards, Frank