Re: 300 RUM
Depends on what you are trying to accomplish.
Brass quality is not that great,even if you can get some from Nosler,wich is far better than Remington.
In terms of cost,its cheaper to run than other large 30 cal big boomers like the 300 Norma,300 Lapua,300 Dakota etc.
But it will get you past 1k with ease with the heavy bullets.