Well here's my take. Done this before. Still get cold sweats when I drill a ramrod hole because of it. But the therapy of making more guns is curing me.
Tried the plug and as everyone will tell you, even if they always use precarves and have never drilled a ramrod hole n their life, if you still have the slab of wood you cut off the bottom of the blank and can match up the grain, then you can fit a nice wood plug/patch matching the grain and glue it in with epoxy or wood glue or whatever and if you do a good job you can hardly tell - hardly. That takes some time - for me as much to find the slab I cut in the first place. Anyhow I did this. Then finished the gun, sanded everything - still good. Then put on the ferric nitrate and blushed the stock with heat, and now the glue line pops up because the heat melts the glue. Work that problem out and finally get it right but I know its there and so can see it and that is a problem, like a splinter, for me. I eventually put a wear plate on and should have done that from the beginning.
Those guys rode horses, used their gun every day, guys shooting dozens of deer every year not to mention all the other romantic stuff they did that we get off on thinking about it in the comfort of our 21st century centrally heated, air conditioned, in door plumbing lives. Sometimes that sixteenth took a lot of abuse.