four of these bullets are not like the others, four of these bullets dont belong...

[littleneckhalfshell]

four of these bullets are not like the others, four of these bullets don't belong...

Ok, Here is a little mystery game with a twist.
The purpose is to identify 11 out of 15 bullets
All 15 have a similar diameter and height but the case on 4 is slightly higher and the bullet is smooth,
while the 11 have a slightly shorter case length but the bullets have three grooves.
The 4 from the title are similar but different to the other 11 bullets, and these I CAN identify since they are clearly marked on the base as U. M. C. 32 S&W The 11 bullets in question only have a U
Where it gets interesting is that of the 11 bullets in question, someone mistook 4 of them for the 32 S&W.
My question is, what gun used the 11 bullets in question with the U on the base? Here are some pictures to help in the identification.

 

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[littleneckhalfshell]

In case you can't see it in the last picture, 4 of the 11 bullets were put into a centerfire gun and were dimpled, though not fired by the firing pin. Someone mistook them for U.M.C 32 S&W centerfire cartridges. The cartridges were found in a box of odd casings that my dad had gotten from someone years ago, as none of the cartridges fit any guns that my family has.

 

[Bitpusher]

In case you can't see it in the last picture, 4 of the 11 bullets were put into a centerfire gun and were dimpled, though not fired by the firing pin. Someone mistook them for U.M.C 32 S&W centerfire cartridges. The cartridges were found in a box of odd casings that my dad had gotten from someone years ago, as none of the cartridges fit any guns that my family has.

Right - they look to be .32 RF.

I've got a Stevens Crackshot in storage somewhere that would shoot them It looks like this one:

 

[Charlie P. (NY)]

.32 S&W Short (rimfire).

 

[turtlefoot13]

I also agree, they look like .32 rimfire rounds. The U will stand for UMC (or Rem-UMC) depending on when it was made.


1910 UMC Catalog Page

 

[littleneckhalfshell]

so, would the rimfire ones have black powder inside? or were they made later with smokeless as well?

 

[Charlie P. (NY)]

Possibly black. Later smokeless. Would depend on the year of yours. After 1890 or so most powders shifted over to cordite, then nitrocellulose and then synthetics.