I have to agree with the other guys that practice is the key, especially practice in field conditions. If you live in an area where you can safely do it, take a steel plate or two out to the woods & hang them in trees & then shoot at them from different angles, ranges, & positions. Juist a couple cylinders a week will make a big difference.
As for practicing with lighter ammo, it makes sense at times. Friendlier to the gun & your body, & also cheaper to reload. Use 460 brass with light charges & light inexpensive bullets.