You can start a "new thread " , "new topic" .

Not from the inside . Boxer primers are .185 and .210 dia . Looking inside may reveal different dia flash holes , 2 holes means Berdan primed . Berdan primers are uncommon in the US and kind of a pain in the ........not worth the effort .

Really large flash holes are usually from NT , nontoxic , primers . Those will take standard primers and typically don't have any pressure issues within normal data .