Sightron has a $50 rebate on their SII scopes thru the end of the year. I really like the Sightron SII 4-16x42 on my 7mm Rem Sendero and I'd like to outfit my 25-06 Savage 110FP with a Sightron. Right now that rifle has a Simmons ProHunter 6-21x44 scope (bought it this way), which has moderately poor glass but absolutely dead-on adjustments. That scope will move to a .22 or possibly eventually a .223.
The 25-06 rifle is being set up for shooting across-the-field whitetail deer as well as eventually antelope and smaller stuff like coyotes and possibly prairie dogs if I go out west. I have plenty of 3-9 scoped rifles here, so I don't need to go smaller power. Given that, should I go with the 4-16x42 or the 6-24x42 as it is closest to what the rifle currently has? I really like being able to see hits on 200y targets with that cheap 6-21 Simmons without having to use the spotting scope, but other than some holes in paper the only thing it has taken is a whitetail doe at 35 yards by my son in late October. He had no problems with the scope power on 6, and had fun playing with it on 10 power looking at deer at 100 yards.
Since more of you have gone after longer range stuff than I have I thought I'd post the question here. I hate to buy the 4-16 and wish for "more" but also hate to buy the 6-24 and think it's "too much."
I'm asuming your using it for set-up, longrange shots and not snapshooting at running deer. Even though the 4-16 is plenty, I'd go with the 6-24. You might not shoot it at 24 power but it's there if you need it. From one Vette nut to another, it's like a ZR-1, you'll seldom need all that power but it's there if you want it.
I think you could learn to love ether of these two scopes on the 25-06. I have a SII 4-16x42 MD and love it. It started on a 7mm RM and is now on a AR-15 varmint gun. But if you want to spot hits at 200 yards the higher power scope will work better for you. Also if you already have a Sightron 4-16, I would get the larger to avoid a double. That way your scopes could be moved around to serve a different scope power needs.
Having said all that, a six power sucks for close up hunting. I lost a deer (5x6 backtail) with that 4-16 on 4 power that trotted away. It went from 45-60 yards and I never found it in the scope fast enough to get a shot off. So if you need a scope for 100+ the 6-24 will work great. But it sounds like you have that figured out.