Yes. All of my Lee
pistol die sets have the decapping pins removed.
Rifle sets are another matter, as those have the neck sizing ball on the decapping pin. You'd have to get an extra pin for each rifle die set and break/grind the actual decapping pin off the end, or just do that to the original one.
I haven't done that yet with my rifle dies, and using pre-primed brass is a bit more of a challenge. I have to resize and trim them to length before I prime them. So all the primed rifle brass I have in storage is all sized and trimmed to length also. Not a
huge deal, I just need to buy some extra pins from Lee, I don't want to modify the originals.
Now, this is
Lee dies....I can't speak about other brands.
It certainly isn't necessary to pre-prime the cases first, I just like to do it that way myself. When I want to load some ammo, it goes a lot faster that way. Just the way
I like to do it, but I tend to wander off the path from the rest of the herd now and then.
I also store my die sets like this, so I can keep the extra parts in each cubby with the die set & turret. Old photo, this drawer is plumb full of them now, might have to go to a second drawer. (I managed to buy several old hardware cabinets that were removed form Home Depot stores from a guy that worked for Crown Hardware. These are NOT available anymore, it was a once-in-a-lifetime opportunity. OUTSTANDING cabinets for storing dies, brass, bullets, primers, tools, and all kinds of things!)