If you buy them off of the shelf, open the boxes and check the individual shells for QC.
I have gotten several in 12 and 20 ga that have had crimping issues. Some were crimped considerably deeper than others. Only way to do that is to compress the wad too much or some of the components are missing
.
Others had sealing issues that weren't sealed good(or at all).
I recently bought 6 more boxes of the H13, # 7's in 20 ga and 6 of these 30 had qc issues.
I still buy them because they work better in my combo's than the other HTL options that are on the market. I just wish they'd get the qc issues worked out.