Ka-boooom and stumped

[DonT]

If it is not too much trouble can you measure the distance from the base to the sharp angle of the cartridge where the neck meets the body of shell and then measure this on one of your loaded unfired rounds (one that has not been fire formed) and then one that has been fired at least once in the rifle.

It would be interesting to see if the distance changed in any of the cartridges.

Also I pulled the bolt out of my AR to look at the chamber area and mine appears to have a slight angle to guide the nose of the bullet into the chamber with a very small radius where this breaks into the chamber. As near as I can tell everything in front of the extractor groove on the round is support by chamber, it is hard to see as I don't want to pull my barrel. maybe if someone has a barrel that is not installed they can try it with a factory round. In the photo of your chamber, and maybe it is just the photo, your chamber appears to have quite a substantial radius. If this is the case is it leaving the portion of the cartridge right ahead of the extractor groove unsupported??? Just curious.

Thanks,
DonT