If anyone has insight it would be appreciated! I'm hoping this is the appropriate forum, reloaders would know more about this than anyone.
I bought 1200 rounds of Hornady factory 300PRC 225ELDM with the plan to shoot it over the next couple years and then reload those casings to as long as possible.
I went through 200 rounds of factory Hornady 300 PRC 225 ELDM and got sub MOA accuracy, immediately upon switching to a new lot number the group at 100yds is about 6 MOA. Switching to the old lot I'm getting sub MOA again. It's definitely the ammo(manufacturer checked the gun because that was my first thought). Hornady said they won't do anything about the ammo because the lot number meets there "minimum requirements" when it was tested and "every lot number is different so it's just the luck of the draw, you should have shot it before you bought that lot number". The really interesting thing is that the carbon marks around the casing neck are completely different. The good lot number has very minimal carbon at the base of the neck. The bad lot has a very dark carbon wavy pattern that goes all the way around. After checking all my lot numbers I have 500rds of this lot and another 200 from a different lot with the same wavy carbon marks and that group 4-6MOA in random directions at 100yds. Any insight on a solution or how to deal with Hornady would be much appreciated. If it's a brass issue I'm assuming I wouldn't want to reload these casings either.
I bought 1200 rounds of Hornady factory 300PRC 225ELDM with the plan to shoot it over the next couple years and then reload those casings to as long as possible.
I went through 200 rounds of factory Hornady 300 PRC 225 ELDM and got sub MOA accuracy, immediately upon switching to a new lot number the group at 100yds is about 6 MOA. Switching to the old lot I'm getting sub MOA again. It's definitely the ammo(manufacturer checked the gun because that was my first thought). Hornady said they won't do anything about the ammo because the lot number meets there "minimum requirements" when it was tested and "every lot number is different so it's just the luck of the draw, you should have shot it before you bought that lot number". The really interesting thing is that the carbon marks around the casing neck are completely different. The good lot number has very minimal carbon at the base of the neck. The bad lot has a very dark carbon wavy pattern that goes all the way around. After checking all my lot numbers I have 500rds of this lot and another 200 from a different lot with the same wavy carbon marks and that group 4-6MOA in random directions at 100yds. Any insight on a solution or how to deal with Hornady would be much appreciated. If it's a brass issue I'm assuming I wouldn't want to reload these casings either.