Dan can you show us a "gun drill type drill"? I want to make sure I understand what it looks like.
Broke
I make my own but TOW sells them
Once in 1/2" or so they track straight unless the operator REALLy works at making it run off. So make SURE its pointed where you want it.
If you drill far enough they will dead center the tang screw.
Something that drills that cut on the sides, twist drills, no matter what point they have, have never done for me reliably.
Ramrod holes are not the only thing that I have used them for. Some SS rifles with through bolts will not tolerate having the hole come out 1/8" off. It can make the stock unusable since it can change everything concerned drop, cast off etc. or move the edge of the receiver off the edge of the stock.
Yeah I could plug the hole, redrill, etc etc but its easier to do it right the first time.
I do burr the edge of the flute just slightly to cut a hole maybe .002 larger than the shaft since these tend to cut exactly to size making a really tight fit for the shaft which can heat the wood excessively due to friction.
Dan