Should you dry fire your rifle to release the firing pin spring for long term storage after the season?
I also remember reading about holding the trigger while closing the bolt. What methods do you use?
The Ruger 10/22's or any rimfire for that matter should have a chamber plug inserted before you dry fire.
Some match grade rimfire barrels don't have a relief groove cut, when dry firing on these you can do serious damage to your firing pin.
Most center fires can handle dry firing without any adverse affects. Holding the trigger back and easing the bolt handle down will decock most. I would never store a firearm without decocking it.
Centerfire's I wouldn't really worry about it. But for all the rifles and shotguns we have we have snap caps, they really help on dryfire practice too. So don't worry, get the snap caps.