I guess I'm kinda in the same boat. I'm about to build a super heavy, super big Dangerous Game Rifle in 404 Jeffery on a Mauser action. I'm doing it mostly for fun and, like OP, potentially for sale. Curiously, the 404 was one of the earliest compact DGRs (vs 500 to 700 Nitro). Dates back to circa 1905. It was eclipsed by 416 Rigby then 458 Lott and later by several American semi failed attempts. Recently the 404 Jeffery has been reborn as a milder kicking thumper available in mere long bolt action (not necessarily magnum action). It has the potential to become the North American working man's affordable safari gun (vs $20,000 double rifles). As African hunting becomes more affordable (and it can already be surprisingly affordable) and North American big game hunting becomes increasingly overrun, I can see quite a niche ahead for this kinda gun. Also, just because it's a big bore doesn't mean it's too big for most North American game or African plains game. I have seen deer skinned out that were shot with 45-70 and really quite amazed at the lack of damage. Big hole in, same big hole going out, and hardly any bloodshot on either side. Just means the hunter has to do some hunting instead of lobbing. The overriding concern, of course, is ammo expense. The Jeff is not something to use for plinking! Besides twenty bucks a round, the recoil, albeit relatively mild for a DGR, is still something to reckon with.
So yeah, I can sympathize with OP's objective. Look at where the market is. May not make total sense ... but we know how much common sense weighs with us gun nuts.
