Re: 300 win mag with 210 Vld
I have loaded that load ( less powder) in many 300 wins with 210 Bergers. Both customs and also several factory senderos. I have used RWS, WW, RP, Graf, and Lapua brass. I feel you are flirting with over pressure loads. The reason the RWS is showing more velocity is it is indeed a higher pressure load even at one grain less. The lower case volume of the RWS makes the load you described close to 100% full depending on seating depth. I find max with RWS and a 210 Berger and H-1000 to be closer to 73 or 74 gr. I am not sure of your barrel length or the altitude you are shooting, but if you are under 4000 ft als. and in less than a 28" barrel please be very careful.