No such thing as a stupid question when it comes to making safe, accurate ammo!
You could try chambering some cases straight out of the packet to see if they fit easily. In factory standard chambers this should be the case. If you've got a custom fitted barrel/chamber then this is an important step.
Running the cases through a sizing die can help to get rid of damaged case mouths and out of round necks at a minimum. It should even up your neck tension too, all of which should help to improve the consistency of your ammo compared to just shoving primer, powder and bullet in untouched brass and hoping for the best!
To summarise - yes!
Now depending on your needs there are other steps you could perform at this point - depends entirely on how far down the rabbit hole you've gone
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