Well tried again today, did the little trick to chamfer the primer mouth thanks @Micky Duck and definitely improved things. I managed to seat them better at pretty much the correct depth but still not what I would call easy and reliably to tell when at the correct depth. Anyway I found an old box of standard Federal 205 with only a couple left and bingo slid right in and seated perfectly !!!
So question - If I do some load development with the match and once used up I will likely switch back to the standard primer, will I have to re-work anything ? General consensus on the inter web (dangerous) is they are interchangeable ? But clearly not in the way they seat. Interestingly the Match had a new box / graphics etc.
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