Thanks for your input.
The measures I posted were head to mid-shoulder. I have had no problem whatsoever previously when reloading Fiocchi cases so am quite happy with the RCBS I use.
I'll do the Prussian blue test but I won't force a NW case in the chamber again. I agree, and assume, that they were fired in a much more 'generous' chamber than mine, hence my intention to proceed with a chamber cast.
Being quite busy for the next 2 or 3 days, I'll have to be patient before doing it.
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