Originally Posted By: hm1996 Originally Posted By: msinc Small bore high velocity rifles sometimes get a weird little ring of hard carbon in the throat. It is very hard and can be very tough to remove.
Distinct possibility, but not entire story; doesn't explain why handloaded bullet marks and factory doesn't when round is chambered . If not marked when it comes out of the die, has to be in rifle chamber as related to coal of different rounds.
Have never seen a bulged bullet caused by crimping before bullet fully seated; this usually results in a bulged shoulder.
A barrel w/low round count will, indeed, usually engrave the lands in the bullet if seated too long for the chamber, however, a barrel w/quite a number of rounds (which could be expected to have throat erosion) can mark a bullet similar to the picture (as I see it).
I intentionally loaded a dummy round long and chambered it in one of my target rifles which does have several thousand rounds down the tube.
This mark @ .320", indicated by jaw of caliper was made by the collet when I pulled the bullet.
The mark @ about .210" was made by the somewhat eroded throat of the barrel:
Throat marks show a bit better on this picture:
Try seating bullets a bit deeper and I think your ring will vanish.
Regards,
hm I can't go out to far. Also,the ring look just like a cannelure? But cut as deep