Hello Covurt,
Please don't let to tongue-in-cheek comments above put you off, and I am sure they didn't mean anything negative.
In longrifles, as in furniture finishing, there are certain time-honored looks that have "passed the test" so to speak over time.
I agree that I think the finish on the rifle you showed was possibly done with dye. It resulted (in my opinion) in a very blotchy look. The grain is pretty obscured.
If you like the dark contrast, I would suggest using Kibler's tannic acid by the directions. After rubbing back it will certainly give you the dark in the soft grain and the contrast.
I'd suggest using the time-honored Aqua Fortis in a couple of coats for the traditional look that does not fade.
Be careful with dyes. Many will fade with time and light exposure. I am all about the long term look, not only the here-and-now look. As a way to alter slightly the color after Aqua Fortis on a certain piece of wood, stains can be useful. Again, do your research and seek the ones that fade the least.
As a top finish, Jim Chamber's finish has a great reputation as does Permalyn sealer or finish. My personal experience with Permalyn is that it is pretty tough and resistant to chemicals when cured.
I am no expert on wood finishing, but know some folks who are. I hope this helps you a little.
Welcome aboard, and you'll find a lot to learn here on the forums.
God Bless, Marc