Should you rev you car to redline before you shift? Like anything the more pressure you put something under, the faster it will wear. A model 59 is already 30 years old to start with, do you know how much it has been shot already? Normal lifespan of a alloy frame gun is 50,000+ rounds with regular maintinance if you use a lot of plus P and keep a good recoil spring in it every 4-5,000rds it will no doubt be less but nothing lasts forever. There is no standard for +P+ so use it at your own risk.