I have a Weatherby Vanguard .257WBYMAG and want to shoot the new large for caliber 133gr Berger bullets. I am changing the barrel to a X-Caliber 1:7 twist 28" heavy profile. My issue is there is VERY little load data for this bullet. I want to use RL25 powder and the closest load I can find is a 120gr. Does anyone have any advise or load data using RL25? Berger recommends H1000 but I cannot find any so RL25 is what I have a good bit of... Thanks for any help!