My daughter bought a Ruger American in 6.5 Creedmore, when sighting it in a couple weeks back she used S&B ammo (was cheap) as well as some Hornady.
The S&B was 140 grain ball ammo, the Hornady was 125 grain SP.
After collecting all the brass, out of a box of 20 all but one round had been "split" open, the crack running nearly all the way from the case base to the neck.
Shooting the Hornady produced NO issues.
For whatever reason the S&B stuff was either weak or undersized (?) allowing it to expand and split.
Never saw anything like it, but it's certainly the last time I'll buy their rifle ammo.
JUNK!!