Yeppers..wooden dowel like DNP sez in the barrel...better to spit wood than metal on the otherside....start small..go bigger.if need be.
always use numbered drill bits
#46 is.0810 #45 is .0820 #44 is.0860 #43 is .0890 #42 is .0935 #41 is.0960 #40is.0980
found another tid bit
Re: .260 Gas Port Dimensions
.081 port for .260, 20" Barrel, std rifle length gas tube.
saw where the Tubbs spring does good in a .260.....thats my go to spring for anything my crystal ballz sees a Tubbs spring and adjustable gas block in your future Wash