The Ruger SP-101 is a fine handgun that will serve you well in the rolls you mention.

Don't believe anyone that says you HAVE to have a semi-auto handgun for protection.

Both revolvers and autoloaders have their advantages and disadvantages, but the revolver is the less complicated of the 2 and more reliable. (It is extremely rare for a revolver to ever jam up and stop working)

The .357 also has the advantage of shooting .38 special rounds for practice.

Magsafe or Glaser rounds in that caliber are the 2 best rounds currently manufactured that won't pass through a (human) target completely.

Both are prefragmented rounds of shot encapsulated in a copper jacket that open up and disperse the shot inside the target after penetrating it causing a larger wound channel than a more conventional bullet does.

There are NO documented cases of a person being shot in the chest with one of these rounds and surviving. (Excluding those that were wearing body armor at the time)

Most hollowpoints will go completely through a (human) target at close range in that caliber. (Personal experience on the job and viewing autopsies)

Carrying a firearm in a bar (or any establishment that serves alcohol) is illegal in most states unless you are the owner of the establishment or an employee of it with the owner's consent.

Good luck -