"Do all" 10.5" barrel?

[AlcoholicusMaximus]

Using Remington 125gr sp & 17.5gr H110 - 2002 2014 2048
Oal 1.946" cci 450 18gr H110 - 2099 2020 2038
The copper on these bullets is very hard.
JFettig, how did you determine that the 18.5 load was too hot? Primers?Pressure ring? Recoil?Gouged brass?
I have not done any accuracy testing yet,but I am crossing my fingers on these Rem 125's, this was the only bullet that failed to feed one time.