I used to be narrow minded when it came to using bore sighters but not any more. I switched to using them a few years ago and find them a very valuable tool in my gun room, dont know how I did without em for so long.
While using the old way of removing the bolt and looking down the bore, well it only works for bolt actions or where you can open the breech and peer through the bore. Doesnt work well on auto's , pumps etc.
I would concur if all you were going to do is 22 rf's a bore sighter really isnt needed. People must realize that everyone shoot a bolt action 30-06.In my case I shoot many different calibers, 17 through 50 cal and everything in between and actions other than bolts. Some of these rounds are $10 a pop so I try not to waste them. Not to mention dealing with extendind sessions of recoil.
I find using a laser bore sighter very easy and effective. For my centerfires, I simply take the rifle and aim it at at object at 20-30 yards and adjust the dot to about 2 inches under the horizontal reticle. I am good to go at 100 yards, it will be on paper with the first shot. Believe it or not this doesnt take the time it does messing with a gun taking the bolt out etc. From that shot I will place the gun's scope reticle back on the bullseye in which I previously aimed and with out moving the gun I will adjust the reticle to the hole in the paper. None of this shooting 3 rounds at 25 yards and then moving further out.
If done correctly you just sighted it in at 100 yards with one shot. This will be darn close depending on the accuracy of you and your gun, minor adjustments can then be made. Of course you could do the same at 25 or whatever yards.
The laser bore sighters are also usefull in getting lasers zeroed on handguns, scopes zeroed on hand guns and even keeping a records your gun's zero. You can even use it for open sights.
For the initial cost of $39, my bore sighter has saved much time and money.