LW,
I own both the 710 package (in 270)and the Savage package (in 243).
The 710 is in a camo synthetic stock and is actually a very tough durable stock. The scope on the 710 has been fine through over 1000 rounds now.
The receiver on my 710 is the nylon receiver and is not nearly as smooth as the Savage. However I believe the new 710 has a metal receiver.
The scope that came with the savage would not focus correctly from day 1. I sent it back to Simmons and not only did they replace it but they upgraded it.
Both of these guns shoot great. My groups are similar with both guns. Off1 sandbag up front and shoulder holding the buttI shoot 1.5" 3 shot groups pretty consistantly with factory ammo. Sometimes less, sometimes more. Not great but thats all I can do the way I shoot.
The accutriger on the savage is a nice feature. I was able to lighten it up just where I wanted it. This can't be done with the 710.
The barell can't be changed on the 710. I'm not sure i'll ever need it but either way it's not possible.
I have killed deer with both guns and between these 2 guns and my Marlin 30-30 I have a tough time deciding which one to take each day. All of them have been very reliable in the field and at the range.
Good luck in deciding