I like to just set my sights on an object and pull the trigger without the cross hairs moving at all. If you have a way to attach any sort of laser that works to.
I have also heard of people balancing either a dime or a piece of brass on the barrel and dry-firing without it falling off.
The best practice will be as close to match conditions as you can get. If you're just interested in general practice...
I think the main points are to go through your usual routine and visualize getting hits while practicing your trigger pull, breathing, and relaxation in whichever position you're working on.
I like to try 'getting hits' on small targets from offhand with any number of targets on the back fence. Other times I'll use an indoors target of an appropriately sized circle on a wall.
You're hoping to:
Evolve a more relaxed, stable, consistent, and repeatable position for yourself
imprint the habit of applying pressure to the trigger on only the best possible sight pictures
tuning out distractions and pretending that you only shoot perfect shots.
Only a little practice is required (10-15 minutes is fine), repeated 3 to 5 days a week.
Each time pick a subject to work on..
- Trigger pressure
[*]consistent shoulder mount
[*]consistent cheek weld
[*]consistent grip hand pressure
[*]rear sight/eye alignment
l[*]ight and consistent forward hand grip
[*]minimizing shifts in position when reloading or checking a spotting scope.
Personally, I have never shot better than after 2 days of dry fire practice with my S&W 442