Thread: Why do .22s have such different accuracy with different ammunition?

My theory is that this phenomenon may have a lot to do with barrel harmonics. Different ammo have different amount of powder shoots at different speed and generate different harmonics. For different barrels, they would each have a particular frequency of harmonics that gives the best result.

Another possible cause is the variation in different ammos dimensions. Barrels are of different throat and muzzle thicknesses, So do ammos thickness. I remember out of all the ammos I have shot the cci subsonic hollow point is the fattest. SK magazine is possibly the thinnest. You could imagine a loose barrel with a thin bullet would not work out well. Vice versa if the barrel is too tight and the ammo is too fat it may cause too much and uneven velocity loss.