777 primers are not made for BH209.

After 3 shots with Winchester W209 primers & using #32 drill bit.


I do prefer the cci 209m's due to their cleanness and lack of carbon build up but i think i bought every darn package the store had. Had to settle for the winchesters.

Heres a sizing chart to help you out,
http://bobmay.astronomy.net/misc/drillchart.htm