Its not a 404 Jeffrey but Remington entire line of Ultra Mags (7mm, 300, 338, and 375 RUM) are based on the 404 Jeffery's case. I would think it would not take to much to get an action for a 338 or 375 RUM and have it rebarreld for a 404 Jeffrey. The bolt and magazine would not have to change just drop a properly chambered barrel in and you would have a new Remington 700 in 404 Jeffrey. Not sure you would want a pusher bolt in a cartridge you could use on dangerous game but it would be doable.

mcb