There are more factors to understand then to just say certain ammo is a no go. I do not shoot WW box as you mention in your post, however you say"Flat Nose". Winchester appears to be a RNFP or Round Nose Flat Point. RNFP should not be a reason that the CW380 would not like the WW ammo. Freedom Munitions is also a RNFP and the CW eats them like candy. So I am guessing that there is something else going on with WW.My CW380 had no problems with Estate and Federal Champion or White box range/target/practice. No go on Perfecta , Winchester WB (flat nose), or Fiocchi ammo. Now that it is broken in any ammo works and I carry PwR"Ball sD ammo for my EDC.
Also a lot of post that the CW380 does not shoot "Fiocchi" is not exactly true. Mine would not accept Fiocchi "linea" as the OAL was too long, however great results with mine on the Defense ammo "Fiocchi Extrema". which has a shoter OAL.
So it is of My opinion to be careful for others to not just look at all "Fiocchi" as a round not acceptable to the Khar CW380 as Fiocchi Extrema may prove to be one of your best reliable defense loads and a round higly praised by Ammo Quest for one.
"These Fiocchi rounds performed extremely well in the bare gelatin test and I would say they performed quite well through the IWBA 4-layer-denim test too. It's way too early to declare them a "winner", especially because one round exceeded the 18" maximum. But truthfully, these rounds performed so much better than I was expecting when I first started this quest, if I knew that I would find a round that would exceed 12" in bare gel and also 12" in denim and also all expand (to some degree), I would have been thrilled. I would say that someone arming themselves with these Fiocchi Extremas would be getting about the best performance one could expect from a micro-pistol. I will be testing the remaining rounds to see if anything beats their performance, but it looks like we've already found two rounds worthy of serious consideration."
I can also buy Extrema for $13.00 and free shipping from Sportsmen's guide. (member price about a $1.00 more for non member.