Are there any cases of a small calibre bullet being fired into an

AR-15 calibers and cartridges are legion. Finding the right one is a matter of matching it to the job you want your rifle to perform.

Small Shot, Big Performance: No. 8½ Shot Explained

Will a solid steel bullet, not casing, ruin the rifling of a barrel with one shot? I have found such rounds in clay pits. - Quora

Do any guns fire bullets with gun powder inside the bullet not in the shell casing like a mini rocket? Would this work? - Quora

50 BMG Shell exploding OUTSIDE a gun - What Happens?

Are there any cases of a small calibre bullet being fired into an artillary barrel or tank barrel? Does the shell go off inside the barrel? - Quora

Has there ever been a revolver with two circles of bullets, one inside the other, going to two barrels with alternating firing pins? - Quora

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How do telescoping and caseless ammunitions work? Why do the gasses not just go around the bullet and out the barrel? - Quora

Will a solid steel bullet, not casing, ruin the rifling of a barrel with one shot? I have found such rounds in clay pits. - Quora

7 Top Modern Long-Range Cartridges - RifleShooter

Steel Pennies And Alternative Ammo: A Different .30-06 M2 Ball

Is there such a thing as a bullet sleeve that would allow a smaller caliber bullet be fired from a larger caliber rifle? - Quora