Large pistol. These are amongst the cleanest primer you will ever use.
Absolutely no need to clean a primer pocket after using CIL primers.
I still have a few of those 2½'s, some 1½'s, about 1200 8½'s, and 1500 8½M's.
I consider the latter two an "elite" primer, and save them for specific uses.
Use with confidence. If they have been stored properly, they last indefinitely.
Regards, Dave.