Originally Posted by
buckfever37
My brother used a number 64 drill bit to drill out the flash hole on his traditions breech plug. So far his gun is now igniting blackhorn and with clean primers!
He needs to recheck his POI and accuracy at the range. It could easily change now.
Personally, if I were in his head and using a drill bit to enlarge, I would have chose #66 first.
Your brother should not pass-on this rifle and enlarged flashhole plug to a new owner either. For that new owner may want to use a powder like blackpowder Swiss or 777 FFF. That enlarged hole size should not be used in conjunction with other powders.