Compared to most, I am still wet behind the ears with regards to shooting cast. In milsurp rifles, I have been content to shot low powder charges that I could get away without a GC. For the few calibers that I have used the GC, the base of the boolits stops in the neck where the GC is held firmly. For these two scenarios, loading is not very difficult and I have been getting pretty good results.
Ok, now enters a 8MM Mauser. Shooting without a GC, no issue. If I install a GS, the seating depth requires the GS to be below the neck, into the case. The GC, going through the neck, opens the neck to the point that the boolit is no longer held firmly by the neck.
Additional information. I am not sizing the boolits. I want to keep them as fat as possible. The unsized GC may be the problem since it is a larger diameter than the boolit.
How do you handle this situation? Do you just crimp the round at the proper seating depth, even though it has minimal neck tension? Or do I need to size the GC and boolit to a lesser diameter? Still think it will seal OK?
Need your experience please.