RE: 350 remington mag or 300 remington ultra mag
One factor that is often overlooked is that if the 300ultramag is going to offer you any advantage over the 300winmag it will be at distances approaching 400 yards and over.Most people don't have the shooting skills to precisely place their bullets at those distances and are unwilling to invest the time and expense for the hundreds of rounds of practise(at ranges to 500 yards) that are required to develop and maintain the necessary shooting skills.If the 300ultramag is your only gun to practise with it will require rebarreling every few years or so as barrel life is not overly long.For the average shooter that only shoots two or three boxes of ammo per year or does not have access to a 500 yard range for long range practise the 300ultramag is a poor choice.