I have read a lot of posts about people buying new revolvers and see that others suggest a lot of dry fire to break it in. I always thought that dry firing was bad for a gun. Is this true or was I misinformed long ago? Also in the past couple months i have bought a Ruger 4" GP100 in .357 and have probably shot 150-200 rounds through it. SO when is it broken in? Should i be able to tell the difference in the trigger. I am a newbie when it comes to guns so any help would be appreciated. Also i see some people suggesting changing springs for a little trigger pull. I was thinking about this but decided to shoot the GP the way it is for now and maybe look into this later. I saw spring kits in Brownell's though and for $10 I figured i'd try it. Do i change just the trigger spring or the main spring or both? lot's of questions!! thanks.