Until you measure the exact diameter of your bullets with a Digital Caliper (available on Ebay for $15), I cannot give you their 100%-certain ID. I can only tell you what the "appear" to be.
Apparently:
Bullet #1 looks like an 1850s-to-1860s .72-caliber 3-groove Minie-ball for a European rifle (but might be a .69 or .70 or .71-caliber).
Bullet #2 is either an 1866 First Alin-Conversion .58 Springfield Rifle bullet or a late-1860s .50-70 Springfield Rifle bullet.
Bullet #3 looks like an out-of-round (fired) musketball which coud be .69, .70, .71, or .72-caliber -- so, we'll need to to weigh it on a Jeweler's Scale and tell us its exact weight in grains (not grams).
Bullet #4 is definitely an 1870s US Army .45 Colt Revolver bullet.
As I indicated above, you can buy a precision-measuring Digital Caliper for about $15 on Ebay, or online at Harbor Freight Tools, or at Home Depot. I recommend you buy one because it is also useful for getting the correct ID of other relics besides bullets, such as coins, buttons, and buckles. The photo below shows how to measure a bullet's diameter with a Digital Caliper.