I reload and have experienced two problems in 40+ years that caused squib loads. One involved claybuster wads that were poorly molded, the base was not fully formed and it caused the gas to escape causing a squib. The second issue was my fault I picked up shells that were damp and reloaded them before they were dry--causing squibs.
Last weekend shooting sporting clays one of my friends was shooting RST's and experienced two squibs and another friend discovered a RST 2 1/2" 12ga shell there the crimp had opened about half open, the shell was discarded but he shot the rest of the box with no issues. A third friend was shooting Wally World Winchester promo loads and the plastic tube was not properly inserted into the base, a piece of the tube was actually on the outside of the case rim (this not the first time I have seen this defect). So problems happen with both factory shells and reloads. I think the best advise is to inspect shells before chambering them and inspect your barrels for a blockage after every shot----wear proper safety glasses and a shooting glove.
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