Re: 25-06 vs .257wby mag
You have to get over the fear of free bore. So long as the bullet is the diameter of the groove diameter, or larger - freebore will not harm accuracy. If anything it can improve longer range ballistics by allow the bullet to gain additional velocity with less overall drag from the rifling over the course of the barrel. Additional velocity means it needs less twist rate, which in turn allows for less friction in the bore and less torquing of the barrel.
Bullets only need an inch or two of rifling to impart the proper rotation. You could have a freebore all the way to the last couple of inches of the barrel and have no I'll effects - so long as the bullet matches or exceeds(and swagges down) the groove diameter.
If you have to track your game, then you aren't using a big enuff gun.