So you are saying that it is a plasma cut rather than a mechanical rupture. Interesting. Regardless, bridging can occur when too large a size of shot is used for the bore......i.e. shooting #2 shot in a 20ga. Therefore the 10 ga.
Early steel shot loads caused many problems which are supposed to be resolved in contemporary loads, however, the horror stories live on.
The only Parker barrel rupture I personally saw and examined was in an Acme 20 ga barrel from RST loads that was very thin, like .008, paper thickness. That was after forward hand position and was a mechanical, jagged, rupture tear, not a smooth cut at all.
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