The usual cause of a "squib" load is a low charge of powder. Keep an eye on the level measured into each case.
I reload target 38 special loads like your's until the case cracks or splits, they generally last for many loading's. Red Dot doesn't need a lot of crimp to burn...they do well with little or no crimp in this instance. If the crimp didn't allow a complete burn you will have a fair amount of unburned powder left in the case...is there unburn't powder in those cases ? If not,
I'm suspecting it may be powder charge related.
Gary
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