+p means an increase in barrel pressure behind the bullet, or a hotter(faster) load.
Simply put, ammunition that is loaded to a higher pressure to achieve more velocity.
Ammunition loaded to higher than normal pressure.
No.
yes
As long as the +p is SAAMI approved ammunition
What does the owner's manual say?
You can purchase high-quality .38 Special +P ammunition, specifically the Buffalo Bore Ammunition .38 Special Short Barrel 110 Grain Barnes TAC-XP Hollow Point (Lead-Free), from reputable retailers. to explore and purchase this premium ammunition for your shooting needs.
1. You will have to call S&W for a correct answer 2. Plus P means higher than normal pressure ammunition. "Other than 38 plus P" could mean another caliber, or normal pressure ammunition. The caliber should always match the revolver you are shooting. Normal pressure ammunition of the proper caliber can always be used in a firearm, unless the firearm is a machine gun which requires higher pressure ammunition to operate consistently.
Depends on how old the revolver is.
You will need to contact Ruger.
http://www.handgunsmag.com/ammunition/demystplusp_0306-7/index.html
Yes it is. A steady diet of plus P ammunition decreases the service life however