Originally Posted by Swamplord
I agree ..... And the same applies to the 375 caliber cartridges as well
It seems to me that one of the most serious obstacles for cartridges suited to ELR is the lack of suitable production actions/rifles. I have followed some technical discussions regarding the unsuitability of commercial actions from Remington and Savage for cartridges like .338 Lapua, even though they chamber rifles for the Lapua cartridge.
Overall, I believe the limited factory options in cartridges of that class has done a lot to limit their popularity. I think the whole short magnum craze took things in the opposite direction, which wasn't helpful in that regard. Some cartridges that had potential didn't go as far as they should/could have because of the lack of industry foresight. I would consider the RUM's to be a good example of that.
IMO, commercial production actions/rifles that are properly built to handle Rigby size cases are sorely needed. They exist in the custom world, but the cost of a custom rifle is a barrier to entry that sorely limits the popularity of ELR capable rigs, cartridges, and components. The Weatherby Mark V is an option, but it will cost about the same as a custom. The CZ 550 Magnum action is suitable, but is not offered in ELR oriented chamberings except through the CZ custom shop. By the time you source a bare action and have the rifle built, you are back in custom territory when it comes to cost.