Everytime I see my boss' Remington 1100 .410 I think about a semi-automatic 45-70. How much pressure could the 1100 action handle if you maybe used the 28 gauge 1100 frame with a 45-70 barrel on it? The shells aren't too awfully different in size, and it gets me thinking. A Browning BAR could handle it for sure, maybe even a 45-90...

[QUOTE]Originally posted by Tyler Kemp:
Everytime I see my boss' Remington 1100 .410 I think about a semi-automatic 45-70. How much pressure could the 1100 action handle if you maybe used the 28 gauge 1100 frame with a 45-70 barrel on it? QUOTE]

I take it you missed the street sweeper. roger

Shotgun pressures run ~8-11K psi, the 45-70 SAAMI max is 28K psi although most factory stuff is a little lower. Don`t know what a shogun action or barrel is rated for but, I`m sure it isn`t 25000+ psi....

double rifles have been built on shotgun actions and most notabily on the Browning BSS shotgun action and many others are also worthy of this idea.

Without actually measuring a 28 gauge barrel diameter might offer enough steel around a 45-70 case to provide for the barrel strength.....all you need then is for the bolt thrust to be worthy. (other factors ignored)

If you have 1/4 square inch of steel in shear supporting the case head you might be sufficiently holding the .45-70 adequately. (marginally but adequately)

Look it over and see what you have....

Then bear in mind there's a lot of other factors we don't know....like what type of steel it is and what it engages into.

Frankly.....you might be onto something there....that is if someone really needs a 45-70 semiauto.

quote:

Originally posted by vapodog:Frankly.....you might be onto something there....that is if someone really needs a 45-70 semiauto.

One more time with feeling! STREET SWEEPER! roger

I don't need it, but thought it would be neat. Bolt would need to be much heavier though, or something like that.

About 20 years ago there was an article in a gun rag (Guns & Ammo i think) about the conversion of a Browning BAR sporting rifle to 458 Winchester Magnum. As I recall the conversion was a success. That would give you some real thump. If you are happy with 45-70 ballistics then the 458 SOCOM in an AR15 would be a good solution. The 1100 is a very poor candidate for conversion to 45-70. The breech and the gas system both are not nearly robust enough in my opinion.

The simpler route would be

http://www.gokart.net/shop-utopia/mccann/rifles/458garand/458garand.html

If you just gotta....

[QUOTE]Originally posted by LRH270:


It's " Beautiful horses and faster women-----" roger

It works both ways...

If you used a 7400 action istead of a 11-87 it would be srong enough. As the 7400 is chambered for the 270 and 30-06. As a matter of fact-- My guess is that the shotgun reciever is of the same metal and heat treatment. But, you would want to talk to remington to be positive.

The shotguns you are speaking of lock the bolt into a barrel extension. The receiver just keeps everything lined up. The fired forces strain only the bolt, locking lug and barrel extension.
A guy with a little time could run a FEA program and tell you what it will do or you could pencil whip it if you remember how. Given that a 28 ga skeet gun takes a far worse beating than almost any rifle I think you would find it would work with factory 45-70 ammo.

About 18 yrs. ago there was on the market a rotary drum magazined 12 ga. shotgun called the street sweeper. The same fire arm was chambered for the 45-70. I do believe it found favor as a 12 ga for military use and was restricted for US. civilian use. roger

the saiga will be the easiest.

Well apparantly, I'm not the first to have imagined a semi-auto 45-70! Tell me more!

quote:

Originally posted by bartsche:
About 18 yrs. ago there was on the market a rotary drum magazined 12 ga. shotgun called the street sweeper. The same fire arm was chambered for the 45-70. I do believe it found favor as a 12 ga for military use and was restricted for US. civilian use. roger

I remember those. They were sold on the civilian market for a few years then banned as a "destructive device" by the ATF. If you had one you had to turn it in to the ATF. If I remember correctly owners were reimbursed market value by the ATF after turning them in and if you got cought with one after a certain date the penities were severe. There were a lot of Street Sweeper owners singing the blues.

I don't remember the particulars about it because I never owned one, but I do remember the recall notices about them. I'm not sure if they went under "NFA" rules or not.

The Sweeper was the pump version and the stryker was the semi-auto. Here is a video of the stryker in action.
Stryker shotgun

IMO, LRH270's link would be the way to go if I was in the market. It's a science project at best, but at least it's been done before.
http://www.gokart.net/shop-utopia/mccann/rifles/458garand/458garand.html

Terry

How come these street sweepers were banned? Doesn't seem any worse than those drum magazines you can but through catalogs for your shotgun.

quote:

Originally posted by Tyler Kemp:
How come these street sweepers were banned? Doesn't seem any worse than those drum magazines you can buy through catalogs for your shotgun.

Probably scared the shit out of Boxer and Finstien, not necessarily in that order. roger

I had a street sweeper before they were verboten. Basically, they were 12 shot revolvers. After you loaded it you had to wind up the spring-assist for the drum which helped it turn. The trigger pull was still stupendously heavy, but you could sure lay down some pellets with it (Mine was the 12 ga., not the .45-70). It had a loading gate and ejector rod like a single action. After your 12 shots, it took forever to reload. Any semi-auto would have a greater sustained rate of fire than one of those things. Bartsche is right...they just looked scary.

Are these street sweepers what Christopher Walken (?) used when he played Cat Shannon in the "Dogs of War"? I always thought that gizmo was a figment of the props department. It doesn't sound like the most battle worthy device for a mercenary incursion.
Steve