Something is wrong somewhere. 23 grams is around 350 grains, an impossible load. (Even a .50 BMG won't hold that much!)
If one of your unfired rounds held 6 grains of powder and one 13 grains, you evidently are double charging some cases, explaining the blown cylinder.
Your use of "grams" is bothersome. If you are trying to weigh charges using a scientific scale, I strongly recommend you get an inexpensive powder scale calibrated in grains. There is too much chance of getting your weight systems mixed up.
Jim
If one of your unfired rounds held 6 grains of powder and one 13 grains, you evidently are double charging some cases, explaining the blown cylinder.
Your use of "grams" is bothersome. If you are trying to weigh charges using a scientific scale, I strongly recommend you get an inexpensive powder scale calibrated in grains. There is too much chance of getting your weight systems mixed up.
Jim