Ramshot Big Game (made in Belgium in the SNPE powder plant of Clermont)is very close to the french-belgian powder SP7/PCL511. Same powders different lots and batches.
It worked well for me with older BarnesX 270grs with a max load of 71,5grs, CCI250 and Winchester cases. Got 2780fps with good hunting accuracy. Think Big Game must do with TSX, but as with all the sperical powders, it works better when close to the maximal loading density and near max pressure.
Dom
