What alloy can I expect from stamp plates?

[bbwhais]

I was given old stamp printing plates. They have a brass 98309printing faces and are backed with a very hard lead alloy. The plates read Holden Red Stamps Holden stamp company . I think it might be lino type or mono type. Boolits cast with this alloy and pure lead in a ratio of 1to 3 gives a very Ihard bollit. Any help would be greatly appericiated. I am unable to post pictures at this time but will continue to try.98310

[badbob454]

i dont know about this stuff i have seen some,, but dont know what it is .

[bruce381]

maybe worth more to some kind of collector of old printing stuff than as shooting lead if so sell high and buy lead

[runfiverun]

brass or copper backed printing plates are quite often zinc.
check the melt temp and such out very carefully.

[bbwhais]

It is definitely lead the melt temp is lower than pure lead is non-reactive to HCL. When alloyed 3 to 1 pure to plate alloy the boolits are very hard but not brittle. The boolits obliterate when fireover 20 gn. of 2400 in 44 mag. The cast boolit weight is 228 out of 240 gn mold. The boolits hold togather even when fired into a frozen burm. I guess what ever it is it works well and i have over 100# of it. So it will keep with my ratio4 to 1

[runfiverun]

sounds like it's a bit harder than lino-type then, maybe mono-type or even foundry type,

[454PB]

Yeah, I'm guessing monotype. I get about the same results mixing monotype and pure lead 1 to 3.