From left to right:
Bullet 1 is a post-civil-war (1870s-80s) rifle bullet -- need precise diameter measurement to tell the caliber.
Bullet 2 is a 20th-Century "wadcutter" bullet used specifically for target shooting -- called a "wadcutter" because it punches a neat round hole which is easily visible in the paper target.
Bullet 3 is not a bullet.
Bullet 4 is another varity of 20th-Century bullet. It has tiny parallel lines inside its body-grooves, thus called "reeded" grooves. No American bullets had reeded grooves until about 1880, and yours looks a lot younger than that.