SOME THOUGHTS ON 357 MAG LOADS
First, suggest trying different brand CASE (Starline).
Second, switch primers (CCI).
If you still get squashed primers, THEN start backing down your H110 (increments of .2g) until you feel more comfortable with the "pressure signs" you're observing.
CONFIRM CHARGE WEIGHT BEFORE LOADING; perhaps a Scale Weight Check set.................
Maybe you just have a 'fast' gun.
Safety first; be careful; check and recheck.
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