A friend just got a new SP 101 in 327. Shoots the 327 ammo with no problems but 12 rounds of 32 mag Fed. factory ammo resulted in 2 split cases. Splitting is near the case mouth for 1/2" or less lenghtwise. The 32 mag ammo shoots fine in 2 different 32 mag Rugers. Nothing visible in the chambers and not sure the splits came from the same chambers or not. Any ideas?