Shooting past 300 yards is going to require some sort of drop compensation. "Kentucky windage" style holdover just won't cut it. Your two main options are using a holdover reticle or dialing your elevation turret. With even moderate winds, compensating for wind is an issue past 400 yards.
There is a lot more that goes into calculating your drops than just the weight of the bullet. Some 200 grain .30 caliber bullets will have dramatically different ballistic coefficients (BCs) than others, depending on shape. This changes the trajectory significantly at extended ranges even if the muzzle velocity is the same with each bullet.
There are good, simple holdover reticle scopes available that can grow with you. I have had good success with both the Zeiss Rapid-Z reticles and Vortex Dead-Hold BDC reticles. Keep in mind these reticles are in the second focal plane of the scope, so they are only calibrated at one magnification setting. The Vortex is calibrated in Minute of Angle (MOA) subtensions at maximum magnification. The Rapid-Z varies by your specific load, and you set the magnification at a point where the reticle subtensions match your rifle's drops (an online Zeiss calculator helps with this process).
I currently have a Swarovski Z3 w/ BRH reticle on my 300 RUM. This reticle is subtended in mils, and is calibrated at Max magnification. I have been practicing a lot with this setup, and I am comfortable with it.
Dialing for elevation is best with tactical style scopes with exposed turrets that track reliably.
Zeiss Conquest scopes are excellent in every regard, and priced comparatively to Leupold's VX3 series.
One option that does the math for you, but still needs to be field verified by you, is the Burris Eliminator riflescope. This scope integrates a rangefinder into the scope. You match your load to one of the scopes built in trajectory models, and the scope will automatically light up a dot on the lower crosshair post, compensating for the bullet drop, based on the range you get with the scope. By most accounts it works very well out to 500 yards, if you practice. I find the scope ugly and cumbersome-looking. It also over-simplifies trajectory.
With more info including an estimated budget, I could give some specific recommendations on a scope.