10-08-2012, 02:24 AM
I don't see any signs of hot loading in the Hornady 123gr AMAX I just burnt this past week, from lot # 3110573. It's a great load out of my 16" AA Grendel barrel/bolt.
If you can measure the neck diameters of your spent cases, that will tell us more about your chamber. There were issues where different companies were marking their barrels as "Grendel", when they were some variant chamber. A variant chamber with a short leade will generate higher pressures with certain projectiles loaded to COL's that would otherwise be fine in a SAAMI Grendel chamber, we just don't know who or to what chamber dimensions many of these variations were cut to.
We are seeing more and more of this with non-Grendel chambers, where accuracy is not there either. This is why Bill A. was adamant about barrel-makers following the chamber dimensions to a "T", as well as some other Quality Control standards that ensure the customer gets a great barrel that will actually run ammo through it safely.
I have pushed the pressures with several of my load development strings, and never even come close to anything like piercing primers.
If you can measure the neck diameters of your spent cases, that will tell us more about your chamber. There were issues where different companies were marking their barrels as "Grendel", when they were some variant chamber. A variant chamber with a short leade will generate higher pressures with certain projectiles loaded to COL's that would otherwise be fine in a SAAMI Grendel chamber, we just don't know who or to what chamber dimensions many of these variations were cut to.
We are seeing more and more of this with non-Grendel chambers, where accuracy is not there either. This is why Bill A. was adamant about barrel-makers following the chamber dimensions to a "T", as well as some other Quality Control standards that ensure the customer gets a great barrel that will actually run ammo through it safely.
I have pushed the pressures with several of my load development strings, and never even come close to anything like piercing primers.