Can my 7mm STW Rifle Shoot Other 7mm Rounds?

I have a decent rifle for having fun at the range. It is a Remington Sendero (1st Edition) chambered for the 7mm STW. Now by no means am I new to guns. But I was wondering if I could shoot any other 7mm bullets through this rifle? Such as 7mm Rem Mag which are cheaper... but SHORTER in the casing. Or a Remington Ultra Mag (RUM)? I figured I should ask before I do something dumb and hurt my rifle or worse myself. Thanks!