My son bought some Magtech ammo for my 8 3/8th ,44 Mag. It was so dirty that after two cylinders you had to bang the cases out. I cleaned the gun real good and he had the same problems.
We measured the case lenght and they were 2.57 to 2.56 which is a little short. Cases should be 2.61 I think this was causing the problems.
There are no problems with Hornady or Remington factory loads.