Re: Dry firing
Google "Indoor Optical Training Aid." 8541 Tactical did a review of it. Essentially it's a scope-cap with a small lens in it with a very, very close focus; optics aren't my forte so I'm forgetting the more technical word. Basically, it allows you to focus your scope on a target about 10' away; hence, you can hang a piece of thread or a push-pin, or any other small object, and use that as your aiming point for dry-firing, thus seeing exactly how much play there is in your natural point of aim, as well as your trigger squeeze. Essentially dry-firing practice, but with a fantastically accurate idea of scope picture and firearm movement.
As long as your rifle has a firing pin that is captured (essentially all modern centerfire rifles), dry-fire to your hearts content. You'll save boatloads of money on ammunition.
My personal favorite is to take a toothpick and leave it dangling in a window screen; from about 40ft, on very low magnification, I've got a great target, and man oh man did I rethink my position after a few hours of that.