I picked up a box of this today at the show.

It doesn't even have an index # on the box- which I find very strange. They seem to have an ever so slight copper wash on the very tip but the rest of the bullet feels and looks like gray steel. They are most definitely magnetic and have a round nose profile. These are much different from the Winchester "metal piercing" rounds. I doubt these Remingtons were designed to go through barriers of any type. They are very, very old though.

What were these used for- shooting holes in model A's?

I'm not going to try it on mine.

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Lost it all in a boat accident

Can you provide some pics? I have some .38 Special armor piercing ammo, but I don't think this is the same thing...

I will try to get some pictures.

I figure they were made before 1935, as they don't list the "Registered Magnum" on the back in the list of firearms, but they do list the "S&W Super Police" and the Outdoorsman.

It isn't a dog-bone box, but it is red, green and white.

Pictures later.

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Lost it all in a boat accident

My SWAG is that steel jacketed ammo would have been made during WW II, since copper would have been needed for the war effort and likely cost prohibitive.

I have some steel jacketed 30/06 that I believe is from WW I.

Now that I have the box in front of me...

The lot is #RA5048

The back of the box reads:
These cartridges are adapted to the following arms...Colt-Offical Police, Officers' Model, Shooting Master, New Service, Police Positive Special, Single Action Army, Detective Special, Smith & Wesson Super Police, Military & Police, Outdoorsmans'.

There are three addresses on the back of the box:
Bridgeport Conn, Ilion NY, Kings Mill OH

Maybe that will help with dating it.

(I had to google what SWAG meant. )

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Lost it all in a boat accident

You might be surprised at what that ammo is worth to a collector. Check here:

THE CARTRIDGE COLLECTOR

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Does your ammo look like this:

http://www.coltforum.com/forums/showthread.php?t=20335

I hope you will post some photos too!

It is the top box in the picture of the thread on the Colt site.

So, it's WW2 vintage...I doubt many of those 50 million rounds can possibly still be around in the hands of the public.
Likely, it was shot up then.

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Lost it all in a boat accident