"try" or "try out" (difference?)

What is the difference between "try" and "try out"?

To try is to make an attempt to do something (or not).

I try not to eat too much saturated fat.

I try to run five miles every day.

To try out can mean either to attempt to qualify for a team sport

Sheila plans to try out for the cheerleading squad.

or, when used with an object, to see whether one wants to qualify something for possible use or purchase.

I'm going to try out a new set of golf clubs Saturday. If I like them I'll buy them.

EDIT

To "try" something also means to sample it. It is also used as an informal way of ordering a particular food item, whether at a dinner or a restaurant.

I'll try a piece of that peach pie, please.

Try the nachos here. They're supposed to be the best in town.

And, finally, try can be used to mean litigate a case in a court of law

The DA plans to try the case in Superior Court.

or test the mettle of someone or something.

"These are the times that try men's souls." — Thomas Paine, The Crisis

"I find your attitude toward my new wife very trying," John told his sister.