From where I sit long range is what long range is for each individual.
Being a dedicated '06r with your years of experience long range for you, I would imagine, is the maximum range of you cartridge and bullet.
I assisted a young fellow with a '06 Win Featherweight with that short barrel. He had trouble with 168 Bergers not making the trip and switched to a heavier Berger. After a couple of sessions in the mountains gaining confidence, experience and knowledge he and his brother harvested very nice bull elk at 590 yard plus. I'd say that was long range in this case.
The fella's only complaint was it caused the kill to be in a very difficult, two day pack out.
Good thing both of them were on the young side.
If it shoots good, get it shooting better. With a temperature insensitive powder.
Put the very best glass on it that you can. The glass will be most probably more expensive than the rig. There are plenty good glass options available. Think very long range on the glass. Plus think about a decent low end power, maybe a max of 4.5 power for the low light moments and up close and personal stuff.