I have a new build on the bench just now. The wire I use for pins measures .071. The drill bit measures .071 , but wood is soft , and bits make sloppy holes. Wood never shrinks uniformly to grip each pin , so sometimes Pins fall out. That's why bees make honey , so the frontier was blessed with wax to use for a myriad of uses. One of which is to keep barrel pins in place. Loose pins going through the barrel pinning loops , are a good thing , so the barrel can work longitudinally when fired. By the time a build is concluded , the barrel pins are in and out many times making the pin holes wear loose. Generally if the stock finish doesn't hold the pins in place well , at the end of build , some spare pin stock goes with the gun , and a piece of bee's wax as well. ...................oldwood