Welcome to LRH. You've come to the right place when it comes to "fact finding missions."
The 210VLD in your 300winmag when pushed to decent velocity is capable of killing deer at 1000yards. As for powders, RL22 is a good powder but it is temp sensitive. My recommendation would to give Hodgdon's H1000 a try.
As for accuracy with the VLDs, they are seating depth sensitive. You can read Berger's suggested process for determining the right depth for your load/rifle here: Getting the Best Precision and Accuracy from Berger VLD bullets in Your Rifle
The bullet to try these days is the new 215grain Berger Hybrid. With their hybrid ogive they are much less seating depth sensitive. Also, they have a better BC than the 210 and as a result, buck the wind better.
There's a guy on this forum who's screenname is Broz. Use the search function and find threads started by him. There is an extensive thread on his testing of the 215 in a 300winmag. Once you read it, you will switch.