Broadside_shot;
Your 25-06 will do just fine for deer. I have taken over 25 deer with that caliber and that includes 5-6 heavy body mulies from 400-500 yards that were one shot kills that died within 20 yards of where they were shot. One went about 75 yards before dropping.
The bullet I used was the Nosler partition 117-120 grain weight. On lung shots, it will open up and exit the far side with a hole about the size of a silver dollar. On shoulder shots, it will bust though both shoulders and exit 90% of the time on even the long shots.
I prefer the heart-lung shots as they destroy far less meat and even if the deer does go for a few yards, the blood trail is very easy to follow.
Saying a 25-06 is too light for deer, is like saying a 300 mag. Wheatherby is too light for elk.
If your shots are going to be between 50-250 yards, sight the bullet in for 2 inches high at 100 yards and use the center chest for your aiming point. will be in the kill zone from muzzle to 300 yards. If you might have shots out to 350 yards, sight in at 3 inches high at 100, kill zone is muzzle to about 350 yards. the 25-06 is a flat shooting caliber for being a non-magnum.
RELH