In my 308 fnar the meplat (tip) of the bullet gets flattened and deformed from the recoil of the rifle slamming the bullets onto the front of the metal magazine. I was using 168 smk and they looked pretty bad so I switched to 178 amax and they do the same thing to the plastic tip. I'm sure it is effecting the bc of the bullet. I was woundering how others deal with this or if it doesn't effect trajectory enough to worry about. I do shoot long range with this rifle 1000 yards.