.... Unless you REALLY want one of those calibers, the 308 will handily do both of those jobs without pause.
I don't know what the head diameter of those listed is, but assume the mag face. If you want to know HOW to disassemble your bolt...
Take the screw/bolt OUT of the back of your bolt, remove the cocking handle and begin removing cocking piece, and firing pin assembly. PAY ATTENTION to how things come out. Push the retaining pin out of the front of the bolt, and remove the head. Replace with the appropriate size, and re-assemble.
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