ORIGINAL: texashoki
All,
I am starting some loads using the Barnes 180 gr. TSX and 4350 powder for my 300 WBY. As the data is somewhat scarce, any and all loads that you guys may have with these components as a starting point is greatly appreciated.
Some early 300 WBY 180-grain factory ammo was loaded with IMR 4350, but it was very hot pressure-wise. Actually, 4350s are altogether too fast for most 30 caliber magnums, and especailly so for ones like the Weatherby or RUM. You'd be well advised to use a slower powder, including possibly IMR 7828 in addition to those listed in other responses.