The load i used:
cbc/magtech case (once fired)
165gn Sierra gameking projectile
37gn Hodgdon H335
CCI Large rifle Primer
all of the cases where hard to extract, some more then others. Just 2 really got stuck so hard that i had to use the rubber hammer..
Thats a pretty soft load, specially made for the short-barreled Ruger gsr
+ I used some Nosler cases for the same load, no problems with them, just with the cbc cases.