OK, which is correct?
She set her 9mm and .38 revolver on top of the closed case and left it all on top of her bed.
–or–
She set her nine millimeter and thirty-eight revolver on top of the closed case and left it all on top of her bed.
Thanks!
OK, which is correct?
She set her 9mm and .38 revolver on top of the closed case and left it all on top of her bed.
–or–
She set her nine millimeter and thirty-eight revolver on top of the closed case and left it all on top of her bed.
Thanks!
I am not a grammer freak but I do read lots of gun publications. I would say the first.
I vote for the first example as well.
Is this for class?

Trick question! The same gun can’t fire the two types of ammunition!
Well aside from the question of ammunition, both are right. It depends on which style manual you follow and the type of publication. The first one does look ‘more’ right to my eye but there’s probably places with a house style which follows the second style.
Shouldn’t it be “left them all on top of her bed”?
When I write I always use the ‘correct’ term. 9mm, .38, .45 1911, Tec-9, 30-06, etc. Most books I have read (both fiction and non) have written it like that.
Opengrave, can I use this as my sig? Pleeeeeease???
Yes, you’re correct. Thank you.
It’s for a novel I’m writing.
[nitpick]
My Beretta fires a 9mm short or a .380 auto cartridge. Of course, neither of these could be fired in a revolver, but in general several weapons can fire multiple ammunition. Theoretically, I could mix the two cartridges in the magazine, but there’s not much point unless I run out of one. On the other hand, it’s very typical to mix bullet types (hollow point, non-penetrating, etc.) within a magazine, which are technically different types of ammunition.
[/nitpick]
What OP? Oh yeah… my style guide doesn’t mention this, but I’d use the first example simply because this is what I commonly see. The second example would make me think too much about what you mean.