Ideal "Harvey Prot-X Bore"

[ca_reloader]

First let me say that my casting skills are basic. I do OK with bullets for my 45/70. I Recently acquired two Ideal 4 cavity molds. One is marked 312521, 138gn and the other is marked 350522. The box for the 350522 is marked 348? Both molds are also marked "Harvey Prot-X Bore". I searched this on the site and found a number of old posts about Harvey Prot-X Bore, but nothing on those two mold numbers. I sort-of understand but neither of these molds have any way of attaching a zinc washer. They are smooth sided round nose cavities. Can any give me an idea of what these are?

[smithnframe]

Can you post pics? I have a few of the Harvey molds!

[ca_reloader]

This is the 312521. The 350522 is the same design.

[lotech]

May be a core mould.

[Sasquatch-1]

I was also thinking they would make a great core mold. They may also be for paper patching.

[smithnframe]

That’s new to me!

[ca_reloader]

I thought core mold as well, but why the “Harvey” marking?

[Char-Gar]

I thought core mold as well, but why the “Harvey” marking?

Fred Harvey also developed and marketed "Jugular" bullets. These were dead soft lead cores, swaged into a jacketed base. The lead expanded like crazy but did not touch the barrel. Speer picked up the idea and marketed similar bullets and thus died the Jugular bullet.

[lotech]

I thought core mold as well, but why the “Harvey” marking?

These were made for Harvey/ Lakeville Arms and quite a few variations were made. I still have at least one of these but haven't seen it in a long time. The Lakeville Arms story is an interesting one. Harvey offered several unusual, maybe innovative, maybe useful products.