1. Defer to the owner's manual. A steady diet will accelerate wear.
2 Yes they are rated to shoot plus P ammunition.
As the previous answer stated, wear will increase.
value of smith & Wesson model 5906 pistol
50-400 usd
Via the screw.
check at: http://stevespages.com/page7b.htm
100-450 USD
50-500 usd
200-800 usd
50-450 usd
1990
100-450 usd
50-550 usd
Ranges $299 - $350 in pristine condition with box and papers