ORIGINAL: MichaelT.
I would be suprised if they were discontinuing that cal., considering they have recently introduced the power level ammo for it, giving it the level of a 30.06 , a 300 mag., and a 300 RUM in power level ammo I, II , and III respectively. See link....
http://www.remington.com/products/ammunition/centerfire/power_level.asp
Hope this helps.
Makes me scratch my head why someone would buy a RUM then download to levels of cartridges that cost much less to buy and more readily available[&:]! Couple that with the RUM's only show a benefit over the 300 wm in handloading capacity. Musyt be for head reasons, so the shooter can say "I shoot and ultra mag".
I agree with the others that the 300 RUm is the most popular Ultra mag and well established, I don't think it will be going anywhere soon because their are many who will load it and finds its potentials. I also agree that it is not neccessary for most NA game.
I have always thought I'd like to own a 300 rum but a bad shooting shoulder means I am less profiecent with its recoil then others so it makes no practical sense for me. BTW i use the 7mm rem mag for antelope to moose and never felt I needed more. Match the bullet to the application and driving it home are all that is required.