Hi Bruce!
First - welcome to the forum...!
Second - it's not the expansion of the head case, but rather the (lack of - in the case of these shells) contraction once fired. In other words, those shells are NOT what you really want to shoot - and it is not Parker specific. Rather - those shells should be relegated to a modern 12 GA with a really strong extractor/ejector. I used those shells only once in a BT-100 and had the same problem. To try to finish up the box - I tried them in a Prussian Daly SxS vent rib trap. Same problem...
For inexpensive shells try Rio's which do go BANG (about 99.8% of the time - it's a primer problem with Rios?) but they do have brass and will extract just fine..
Anyway - now you have gotten over your first post - so we expect pictures of your VH next.. She sounds great!
John
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