Here is the reply from Fiocchi. My pistol may need broke in more, or it just might be a picky eater... Top notch customer service from Fiocchi.
"I had some spare time this morning so I finally took your ammo down to the range, and along with our centerfire ballistician, we chambered and fired that ammo through 5 of our test pistols. These were a Smith and Wesson M&P, Glock 21, Sig 220, Springfield XD45, and a very well-broken in Kimber 1911.
Our results were the same for every pistol. The first thing we did was load a single round into a magazine for each pistol to check chamber function. This was tested by pulling back the slide and letting it go into battery under the full strength of the recoil spring. All 5 pistols chambered fine. We then loaded and fired 5-8 rounds through each pistol, checking chambering on loading each time. All test pistols chambered and fired all rounds satisfactorily. I paid extra attention to our S&W and Kimber test pistols as they are particularly well-used. Both functioned as they should.
I thought you would want to know these results, they are not scientific in any way and are meant to simulate real-world loading and shooting done by an average user of our product. Now, we did not have an HK test pistol, so the results don’t really say much about your particular issue. Our test pistols also have many rounds through them so its also possible your gun is new enough that it just needs more time to break in. I have found that to be particularly true for .45 caliber automatic pistols.
Best regards to you, stay safe and well in this crazy world."