The 710 is a good rifle and in my opinion, an excellent value for yor money. Remington sells much more expensive rifles, but they don't really shoot any better. If you take care of it, clean it regularly, it will last your lifetime without any problems.
I'm not a fan of Bushnell optics of any kind. They do have some commercial grade glass that's of decent quality, but with hunting optics, you realy get what you pay for. Saying that, if you are not planning a trip out of state, overseas or a once in a lifetime tag, then it should work just fine for you.
The secret to any hunting rifle and accuracy is finding the right load for the rifle. Bullet weight, bullet design, type of gun powder and the quantity of gun powder will decide how accurate it will be. Most any modern rifle is capable of sub 1 inch groups at 100 yards. The very high end, custom rifles are garanteeing half inch groups. The difference in accuracy is important to some, not so important to others.
You will easily spend more on ammo then you did on the rifle trying to find the right combination to the best accuracy. If that's not a priority, enjoy it and have fun. Some people go absolutely **** figuring that sort of stuff out. I know I did!!!
For $300, you didn't get ripped off, but it wasn't a steal either. You shouldn't have any trouble selling it for that price if you want to get rid of it, so I think you're right in the ballpark of what it's worth.
Eddie