Sorry, Kevin--I must have misunderstood you. I thought the idea was to have users--i.e., independent people other than the Chapuis product manager--offer unbiased opinions about the rifle.
The Iphisi's functioning is exactly like all other Chapuis African doubles (Brousse and Jungle, called "Elan" here in the US)--nothing different about the action that has been around since at least the '70s, the extractors, the sights, the stock, the recoil pad, etc. The only differences between this model and all other Chapuis African doubles are the following:
1 - The price point--achieved through minimal engraving and the colorcase finish, and
2 - The scope mounting system. Besides the Recknagel pivot mounts (common to all Chapuis African doubles), the Iphisi has Talley bases out of the box, for those who don't want to spend $500+
I would also add that as of later this year, all .375, .450-400 and .470 Chapuis doubles will take specially-made Skinner Sights accessories: a) an adjustable peep sight mounted in the rear scopemounting slot, plus a flat block to replace the existing express sights; and b) a ready-made adapter for red-dot sights to be mounted on the forward scopemounting slot. These will be available for the Iphisi and the Elan models and require no gunsmithing or alteration to the rifles.
As for the .450-400 Iphisi, I'm introducing it in 2025. In the spirit of full disclosure, 2024 is the last year in which I'll be able to hold the $9,999 MSRP for the Iphisi (USA market). Production costs in France have gone up and I'm already operating on a fairly thin margin, so I expect that starting next year MSRP will be a bit higher. The .450-400 will cost more than the .375, of course. I will keep everyone posted about the specifics (which I don't know yet, so I couldn't answer "by how much?").
Lastly, it's not that the Iphisi "likes" Hornady ammo; it's expressly regulated for it, as per my specifications to the factory. Naturally, it will very likely do fine with other brands or loads--I shoot my regular 270gr load in mine and it does very acceptably with it.