@ET1775 Thank you in advance. This is a good deal in what more experienced hunters than me consider an excellent all around chambering for a double rifle. This Heym 88B PH Model looks well cared for if, not almost new.
I have to admit that I have two Merkel 140 AE's that are being shipped from Holts in England. They include scoped .416 Rigby and .375 H&H rifles. I have enough dies, bullets, and brass for each cartridge so there won't he a scavenger hunt to load for them. I have none of those components for the 450-400 cartridge, unfortunately.
So, having a .416 Rigby double and the loading components for it on the way, logic tells me that I do not need a 450-400. But all my doubles will all be chambered for rimless cartridges, not rimless that one can drop into the chambers without having to push over the extractor pawls. Further, while being a perfectly adequate Merkel, it isn't a Heym. Someday I will do a side by side comparison of my Heym and Merkel doubles and not only list but rate the operational differences. Maybe there will be none that are noticeable. Then there is my upcoming trip to South Africa. Must avoid temptation...
Good luck to you and please, save me from an alluring act of fiscal irresponsibility!