Usually my C9 will shoot any load that I feed it from dribblers out the barrel to hot +P loads.

The other day when I went out to test some 38 and 9mm loads I had an eye opener.

All the copper JHP loads ejected from 124 to 147 gr bullets but
when I tried my coated 115 gr. bullets, I had three fail to feed another round
or the slide not closing and the trigger not being able to pull.

I took the three rounds home for closer inspection, to see what was up.
These same loads in my PT9 5" work 100% from 1.08 to 1.12" OAL.

I found out that my C9 is finally picky on how you load the 115 gr
bullets from Gallant.
If they are just a touch over a 1.12" OAL............
and the belling of the case is not 100% level .........
due to their Ogive shape, they will not "Plunk" in my chamber.

I cranked down the crimp a touch and reseated the three rounds
plus a box of 50 that I had loaded for the family and all was well again, with the little C9 pistol.

It is funny how the shape of a bullets Ogive can have, on how it is loaded.
A Berry 147 plated RN bullet will plunk all day long in my C9 with a OAL of 1.16".

Just glad it was me.............
I though that maybe I had mechanical or trigger problems.

I made a note to seat these 115 coated to 1.10" for the C9, to prevent future problems
since they are just for target use and tin cans.