Ed, in all seriousness, you get what you pay for in the cost of a scope, what you spend now will more then likely prevent you from having to replace it later down the road. If you can afford a Leupold MK4, Nightforce, Kahles, Bushnell tactical, Vortex Viper, or the Razor. Pick one with a good mil-dot reticle and you'll do fine with it for years to come.
You don't need a lot of power for 600 yards, any 10x-16x will be more then enough, a large field of view will serve you better for hunting in the field when game might need to be shot at close range so don't get too carried away be magnification 2.5-10/3.5-10/3.5-15/4-16 is more then enough.
Here's a link to a rifle that's FS that makes a good starting point for a factory rifle. It has a 40X trigger, (best thing Remington ever put on a gun), a H&S Precision Stock which is sound for a platform and can even be improved upon with a bedding job, and in a caliber that has the proper barrel length, 26". All for a good price and I know they don't make these anymore either.
Nosler Reloading Forum • View topic - Remington Police Sniper .300 Win Mag
I don't know Vince but I do know he's never given me a reason not to want to do business with him..... for whatever that's worth, but is a good rifle to work from as is and might be worth taking a look at?
The reloading part just takes a little research, and experience through testing what works and what doesn't? In the end you'll have the setup to quickly work through a load development and never again be stuck with factory fodder that's not tuned to the gun you're using. As well as the cost savings not have a bunch of boxes with 15 rounds in them and wondering what to do with them?
Best of luck to you Ed and hopefully you'll be making those 600 yard shots with boring regularity soon enough?