Presumed WW I or WW II Ammo identification

Hi! I am building a display case for some WW I and II military items and have 4 bullets, no shell casings, that I am trying to identify. They are a grey metal measuring 1.5 inches long and 3/8ths of an inch in diameter and are hollowed out as if there may have been some type of explosive charge at one point or even a tracer round? They do not appear to be made of lead, perhaps a composition metal. Does anyone have any possible idea as to the type of ammo, caliber, reasons for the hollowed out bullet, type of gun that may have been used in the firing of the bullets, etc. Thanks so much!
image

Hi Jim,

It is a toy bullet used in the Stallion 45 cap revolver cartridge. It was made in the 1950’s by Nichols Industries, Inc. of Pasadena, Texas.

Regards,

Fede

Wow! Thanks for that info Fede. Never in my wildest dreams would I have thought they were toy bullets since they have some heft to them although I don’t know the exact weight. But it provides some background for some further research. Thanks again!