I have a .45 T/C extented ragne rifle with 28" barrel.It blows the bolt open when I load above 120 grs.I only shot it once with 150 grs .It blew the shotgun primer out of the gun.I saod hey maybe they got an ejector in this thing.I didnt do it twice.It will take 110 grains safely with sabots but the 120 tried to open the bolt a little and the primer is very loose.I replaced the bolt and where the primer goes still does it.I might have to send it am my comtender that fires on closing with the hammer cocked together.

Flash hole in breach plug cannot be more than .033 yours is probably .040 check it ! .030 /.033 is correct hole for primer or Percussion caps